Re: [Tutor] Python
On Thu, 15 Aug 2013, Jake Wohldmann wrote: Hello I am a beginner to using any type of programming lanhuage How long does it take to become fluent at a script? Do you know and good sites to learn python? I will only be able to practice python on weekends since school is starting. I was also wondering if I could use python on my android phone. The official python tutorial is pretty handy - www.python.org Also if you can install 3rd party APKs, search for the SL4a (Scripting Layer for Android). You can install Python3 (recommended - the future of Python), or Python2.7 (current version). Not all 3rd party modules are available for Python3, but most 3rd party modules aren't available on Android anyway so you wouldn't be missing out too much. HTH, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 3to2?
On Sun, 21 Apr 2013, Steven D'Aprano wrote: On 21/04/13 04:32, Jim Mooney wrote: I was looking at google pengine for python and it only supports 2.7. I've installed 3 and would rather not go back (I kept doing Print without the parentheses for awhile and it was really annoying ;') So the question comes up. If there is a 2to3 script, which I got working, is there a 3to2 script?. Or does that even makes sense since 3 has features 2 does not, although I read somewhere that many have been backported? from __future__ import division, print_function from future_builtins import * This is the route I recommend, and take myself. Usually I'll do: from __future__ import print_function, division, unicode_literals try: input = raw_input range = xrange except NameError: pass #using python 3 already, whee! which makes you able to write code that mostly looks to Python3. You could also look at how Django does their 2/3 support: https://www.djangoproject.com/weblog/2012/aug/19/experimental-python-3-support/ Looks like they use the `six` library: http://pythonhosted.org/six/ HTH, -W ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] design question (Django?)
On Sun, 14 Apr 2013, Don Jennings wrote: On Apr 14, 2013, at 7:06 AM, Albert-Jan Roskam wrote: Subject: Re: [Tutor] design question (Django?) On 13/04/13 09:48, Albert-Jan Roskam wrote: I think I have to make a diagram of this. This stuff is quite hard Would it also be a good idea to simultaneously make a paper-and-pencil drawing of the UI? Absolutely! Test it with three users. See Jakob Nielsen's brief take on the matter: A recommendation - check out Balsamiq Mockups for UI design. If you plan to make this project open source they'll provide you a free license (with a bit of documentation, e.g. link to project on Bitbucket/Github/etc with a OSI approved license). They also have a free web demo that's pretty powerful and just nags every 5 (or 15?) minutes. http://www.balsamiq.com/ I've not found a better tool for doing quick and rough UI mockps! HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Guidance if possible
On Fri, 12 Apr 2013, Alan Gauld wrote: On 11/04/13 23:33, Scurvy Scott wrote: the other for something like this. I have no intention of doing anything professional/shady/annoying with this code and want to write it purely for my own amusement as well as to learn and obviously to perhaps win something cool. Seems reasonable to me. Try looking at the http, urllib and cookie stuff in the stdlib. Ick httplib/urllib - if you want to write code for getting information off a website, the requests module is the way to go: http://docs.python-requests.org/en/latest/ It makes http requests pretty trivial. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Looks like a judgment bug.
On Thu, 11 Apr 2013, Timo wrote:
Op 11-04-13 12:41, w qj schreef:
I found this under Windows Python3
l=http://f/;
l[-1] is not '/'
False
and this under Linux Python3
l = http://ff.f/;
l[-1]
'/'
l[-1] is not '/'
True
It's Looks like a python bug?
This looks like a is not versus != thing. Someone (I think Steven
Apprano) posted a couple of days ago on this mailing list to only use is
and is not when comparing to None.
You're absolutely correct.
`is` compares the identity (basically id('/') == id('/') )
*sometimes* CPython will use a trick that caches smaller strings, so this
might work one time:
x = '/'
y = '/'
x is y
True
But then the next time you do the same thing it could return False. Or on
a different OS. There's nothing (that I'm aware of) that will guarantee
either result in this case.
In the example case we were comparing that `l[-1]` referred to the same
spot in memory as the literal string `/`. And as the example showed,
sometimes it will be, other times it won't.
The takeaway is to use `is` when you want to compare identity, and `==`
when you want equaltiy. For example,
That car is *my* car.
The car I'm referring to is one specific car. But if I were to say...
My car is a Chevette.
That would be more like saying `car.model == 'Chevette'` - many different
cars may actually be a Chevette.
HTH,
Wayne
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Re: [Tutor] Code to open a website
On Sat, 9 Feb 2013, mann kann wrote: Dear Jedi, I wrote my first program but it doesn't open a website as I intended it to. Please correct my mistake. Sincerely, Mann You'll actually want the webbrowser module, which will open the links in your web browser - at least if you want to load sites like YouTube. HTH, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running multiple versions of python
On Thu, 10 Jan 2013, Fowler, Trent wrote: I am running Windows 7 and I've installed two versions of python, 3.3 and 2.7. Python 3.3 was the first version I installed and I was able to run scripts from the desktop (not the command line). I installed python 2.7 so that I could get numpy, scipy, and matplotlib down the road, but I found that all the scripts on my desktop defaulted to python 2.7. Since I coded in 3.3 this caused some issues. I was able to fix this by right clicking the script icon, browsing programs, navigating to the python 3.3 file in my C: drive, and selecting the idle inside that directory. But then I found I wasn't able to run those scripts with python 2.7 using the exact same procedure. Unfortunately I don't know command-line programming very much at all, and it seemed like most of what I've seen online is geared towards that as a solution. Ideally I'd like to specify which python I want to run a script from the desktop, or possibly while I'm editing the script. I basically have this same setup. To make things work for me, I do this: - Go to your Python 2 directory ( probably C:\Python2.7 ) and rename python.exe to python2.exe and pythonw.exe to pythonw2.exe - Make sure that both your Python 2 directory and Python 3 directories are on your path. You do this by opening the Start Menu and typing Path - then hit enter. You should have an environment variable called PATH - if not, create a new one. You'll want to make sure that you have the paths to Python 3 and 2 in there. Assuming you've got C:\Python3.3 and C:\Python2.7, you'd want to have a path that contains C:\Python3.3;C:\Python2.7; Now if you run a python script from cmd or powershell you should be able to do: C:\some\path python2 a_matplot_program.py HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] writing effective unittests
On Thu, 3 Jan 2013, Japhy Bartlett wrote: The general idea is to write tests that use your code in realistic ways and check the results. So if you have a function that takes an input and returns a result, you write a test that passes that function an input checks the result. If some inputs should make it error, you write a test that checks that it errors. In web programming, a common thing is to make a web request with different variations of GET / PUT params, then check that it returns the right status code, or that the result is valid JSON, etc. Basically, try to simulate all the things a real world user would be able to use, and test that your code does what you intend for it to do. TDD is a good principle but usually seems a little too pedantic for real world programming. Where tests (in my experience) get really useful is in making sure that a new change hasn't unexpectedly broken something already written. That's funny, I find it exactly the opposite - unless I'm writing some prototype throw-away code, doing TDD has actually exposed problems with the underlying program structure precisely because it *is* pedantic. Granted, if I needed to get a fix in place in production code that was costing buckets of cash every minute it wasn't fixed, I'd write the code, push that out, and *then* write the tests... but when I've been practicing TDD I've not had that problem. My experience is that it has a tendency to bundle all the development costs right up front - instead of a little here, a little there. But... that's just my experience ;) -Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IronPython any tutors with experience out there?
On Thu, 3 Jan 2013, Bjorn Madsen wrote: Hello PythonTutor- I'm a scientist and very happy with python 2.7. I have been asked to assist a development program where everything is written in dotNET/ C# (visual studio 2012) and luckily Microsoft Visual Studio supports IronPython which is a clean Python implementation in C#, so I can use the Python syntax I'm so familiar with... However ... to interact with the c# modules which my colleagues wrote, I need to add clr references. Example: import clr clr.AddReferenceToFile(Mapack.dll) from Mapack import * dir() Unfortunately I can't get it to run and the tutorials after 12 hours of google-reading are terribly sparse. Is there any experience somewhere in the network with IronPython in VSTO-2012 in this forum and what could the top five clr.addreference bugs be? Assuming everything else checks out... what you have to import is the namespace of whatever the .dll is. So if it was compiled with a root namespace of say, Fizz.Buzz.Foo Then you'll have to do: from Fizz.Buzz.Foo import * Though, I've never tried that version. I always did import Fizz.Buzz.Foo as foo in my own code. HTH, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Recommended texts for self-study to master software engineering?
On Fri, 14 Dec 2012, boB Stepp wrote: This is obviously not a directly python-related question; however, I do believe that it would be of interest to many aspiring programmers who are diligently learning python on their own. So, through self-study, I would like to be able to acquire the knowledge I would need to become a competent designer and programmer, using good software engineering practices. Now I could go online and look at typical courses taken by those pursuing software engineering or computer science degrees and even come up with the textbooks that such courses use. But I would have no idea of how well-suited such textbooks would be for self-study. So my question is what would be a sequence of books to acquire the knowledge I would need that are especially well-suited to self-study? I may be asking for the unanswerable, but I am hoping to be pointed to some good texts for my future studies. Rather than simple self-study, why not take advantage of the offerings by such folks as Coursera, Edx, or Kahn Academy? They all have free courses in programming and software development that require a large degree of self-motivation (after all, you didn't pay anything for it so you don't have the same drive as regular college), but it has the added benefit of hundreds, perhaps thousands of other active participants who are also learning at the same time. *Most* of the Python books that I've read are at least as well-suited to self study as any of the rest of them. Although, my own personal experience is that contributing to this list has done more to help me really understand the basics of Python and development than anything else. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tutor Digest, Vol 106, Issue 5
On Tue, 4 Dec 2012, Steven D'Aprano wrote: On Mon, Dec 03, 2012 at 05:56:30PM -0600, Luke Paireepinart wrote: I just wanted to make the observation that, at least in gmail, the default behavior is to hide the entire quoted text behind an innocuous ... button. Good lord, the more I hear about Gmail, the more horrible I discover it to be. Why does anyone use this crappy, anti-social product? Because it didn't use to suck. Also protip: you can use insert better client here with gmail. Like alpine ;) -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] I am learning python3 and would like some more python3 modules/programs on my...
On Tue, 9 Oct 2012, Prasad, Ramit wrote: You can even think about switching later if necessary. Although, it is probably easier to go from 2 to 3 due to the existence of automated conversion tools. There is actually a python 3to2.py script now. And if you pick up Python 3 you'll have much less problems because you'll develop the correct mental model for dealing with strings/bytes, so if you *do* do any Python 2 work, then n problem. Unless you're using Django or one of the other big packages, my recommendation is always to pick up Python3, with the caveat that many of the tutorials will be Python 2 oriented, so if they run into problems, they should ask a question here. Plus, there will be no Python 2.8. Sure, people are still developing tools in Python 2.x, but more and more are migrating to 3.x, and *many* of the larger packages are Python 3 compatible. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Through a glass, darkly: the datetime module
On Sun, 7 Oct 2012, Steven D'Aprano wrote: It is a little-known fact that Unix sys admins, and C programmers, can only type a fixed number of keys before their brains explode. Sad but true. Since nobody knows how many keys that will be, but only that it is fixed at birth, they have a horror of typing four characters when two would do. lol. I really did, too! +1 (I think this might apply to COBOL programmers, too.) -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Lotka-Volterra Model Simulation Questions
On Sat, 29 Sep 2012, Oscar Benjamin wrote: On Sep 29, 2012 2:25 AM, Alan Gauld alan.ga...@btinternet.com wrote: On 28/09/12 21:32, Jim Apto wrote: I'm relatively new to python, and was asked to program a lotka-volterra model (predator and prey relation) simulator. x represents prey population y represents predator population so use names that say so, like preyPop and predatorPop Its only a few extra letters typing but makes things much more readable. As a mathematician I'd have to disagree with you there Alan. This model already has an established notation: Regardless of established notation, unless only mathematicians will be reading the code, and only those intimately familiar with the equation, it makes much more sense to use meaningful names. Because that way, when sending the code to a mailing list full of non-mathematician programmers, they'll know exactly what the variables are supposed to be for, so they wont have to look anything up on wikipedia. After all, they've got a finite amount of volunteer time, and would you prefer to get more advice about logic errors, or the guarenteed responses about variable names? I for one, prefer to get the most value from my question as possible. It shows respect to the people I'm asking, and to everything else that they could possibly be spending their time on, including answering other questions. Respectfully-and-somewhat-tongue-in-cheekily, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Lotka-Volterra Model Simulation Questions
On Sat, 29 Sep 2012, Wayne Werner wrote: On Sat, 29 Sep 2012, Oscar Benjamin wrote: On Sep 29, 2012 2:25 AM, Alan Gauld alan.ga...@btinternet.com wrote: On 28/09/12 21:32, Jim Apto wrote: I'm relatively new to python, and was asked to program a lotka-volterra model (predator and prey relation) simulator. x represents prey population y represents predator population so use names that say so, like preyPop and predatorPop Its only a few extra letters typing but makes things much more readable. As a mathematician I'd have to disagree with you there Alan. This model already has an established notation: Regardless of established notation, unless only mathematicians will be reading the code, and only those intimately familiar with the equation, it makes much more sense to use meaningful names. And lest I sound like I'm completely ignoring the mathematical aspect - what *does* make sense to do is this: x = prey_popluation y = pred_population # insert mathematical formula here. This satesfies all parties: 1) It gives us programmers nice, meaningful names 2) It gives mathematicians the formula that screams FORMULA! 3) It clearly separates the math-y bits from the program-y bits. Because let's face it, x = float(input(Starting Prey Population: )) isn't exactly something you find in (most) math classes. And I think clearly separating concerns is always a good thing. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] OT: Netiquette
On Fri, 28 Sep 2012, Bod Soutar wrote: On Sep 28, 2012 4:47 AM, Dwight Hutto dwightdhu...@gmail.com wrote: Yeah, all up in my fucking cranium with nothing but me and God to hold on to one another. -- Best Regards, David Hutto CEO: http://www.hitwebdevelopment.com Probably not a good idea to advertise that your the CEO of hitwebdevelopment.com if your gonna post like that. Bodsda That's OK, if you don't like that sort of attitude you're obviously not in his target market (the one that enjoys was it 60MB GIF files, and background music). -W___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Lotka-Volterra Model Simulation Questions
On Fri, 28 Sep 2012, Jim Apto wrote:
Hello folks,
I'm relatively new to python, and was asked to program a lotka-volterra model
(predator and prey
relation) simulator. The program basically will basically have a menu that
takes user input, collect
data, and then create a graph. Currently i've been working on the simulator
section; I can't seem to
get the lists right. I've assigned the following variables and parameters to
the model for the program:
I don't know anything about the Lotka-Volterra model, but I've definitely
got some recommendation
x represents prey population
y represents predator population
dy/dt and dx/dt represents growth rate of the two populations over time
t represents time
a is the growth rate of prey
b is the rate at which predators kill prey
g is the death rate of predators
d is the rate at which the predators population increases by consuming prey
The equation:
dx/dt = x(a-by)
dy/dt = -y(g-dx)
The code I have for this section is:
def deltaX(a,b,x,y):
dx = x*(a-b*y)
def deltaY(g,d,x,y):
dy = -y*(g-d*x)
The simulation function is where I am having trouble.
For the simulation function, I need to ask the user for the number of runs and
then save it in a
variable, create a list for prey and predator. For each run, i need to
calculate the increment of
change in prey and predator populations by calling the deltaX and deltaY
functions, then save these in a
variable, and then update the population information. The newly calculated
populations then need to be
added to the existing lists. After this is completed, a function for the graph
is called.
The following is my current simulation function:
def simulation():
a=eval(input(Growth rate of prey:))
b=eval(input(Rate at which predators eat prey:))
g=eval(input(Death rate of predators:))
d=eval(input(Rate at which predators increase by consuming prey:))
x=eval(input(Current prey population:))
y=eval(input(Current predator population:))
Woah! Stop that right now - eval is an *incredibly* dangerous function. If
you want to convert these numbers to integer or float, there's the int()
and float() function. Additionally, single letter variables are really
horrible. You could do:
prey_growth_rate = float(input(Growth rate of prey: ))
predator_consumption_rate = #your code here
predator_death_rate = ...
predator_growth_rate = ...
initial_prey_population = ...
initial_predator_population = ...
deltaX(a,b,x,y)
deltaY(g,d,x,y)
I don't see where you defined deltaX or deltaY...
n=eval(input(Number of runs:)
r = 0
count=0
yList = [0]
while r = n:
r = r + 1
count = count + 1
yList.append(dx + dx)
zList= [0]
while r = n:
r = r + 1
count = count +1
zList.append(dy + dy)
It seems terribly wrong. The following is my graph function:
def drawCurve(yList,zList,n):
x = pylab.arange(n)
pylab.title(Foxes and Rabbits)
pylab.ylabel(Number of predator (Foxes))
pylab.xlabel(\nNumber of prey (Rabbits))
pylab.plot(x, yList, 'b')
pylab.plot(x, zList, 'r')
pylab.legend(('Rabbits','Foxes'),loc='upper left')
pylab.show()
The issue i'm having is the logic in the lists. How can I create the
simulation function using lists
and make it perform the expected task of creating a graph? I can't seem to get
the logic right.
Posting an image of what you expect, and what you got instead to imgur or
some other free hosting site would be a good thing to do.
When asking a question you should always post what you wanted to happen,
and what happened instead.
HTH,
Wayne___
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Re: [Tutor] help me decide
a certain way to do things and you don't really have a choice if you'd like to do it different. Python is an enabling language - which in my words means it's a language that gets out of your way. My experience is that when I write Python code I can express the solution to a problem the way I want to. If it's easier to express the solution in an OOP way, I can do that. If it's easier to express procedurally, or even functionally, I can do that too. Which meant that it's easier to just get stuff done. I don't have to worry about how I can shoehorn the problem into something that the language can solve - I can just solve it. So I find great joy in writing Python code, and encourage everyone to learn it. My recommendation for you would be to learn some OOP basics, and once you feel comfortable around objects start learning Tkinter. Unless you really want to do some web programming, in which case, do that ;) HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running more than one python program at the same time
On Mon, 3 Sep 2012, William R. Wing (Bill Wing) wrote: junk = raw_input(Yes Master?) You don't even need the 'junk' bit: raw_input(Yes Master?) Will run just fine. HTH, -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] making a shortcut in windows
On Tue, 4 Sep 2012, Garry Willgoose wrote: Oscar, I actually just want the functionality of a shortcut so that I can put an icon on the desktop. symlink allows that in Unix (and a few other capabilities that I'm not that intersted in) and just want something equivalent to the menu item for making a shortcut in Windows. At least in Windows 7+, you can use the mklink command (as administrator): import subprocess subprocess.check_call(['mklink', '/D', #Use /H for a hard link '\users\yourname\desktop\yourfile.txt', '\path\to\yourfile.txt']) HTH, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Why begin a function name with an underscore
On Thu, 30 Aug 2012, Steven D'Aprano wrote: On 28/08/12 21:24, Wayne Werner wrote: On Mon, 27 Aug 2012, Richard D. Moores wrote: What the best way to test if something's an integer? try: whatever_you_want(supposed_integer) except ValueError: print(Oops, that wasn't an integer! Please try again) That's usually the best way... Actually, that's close to the worst way, since you take a nice, useful exception which prints a traceback showing exactly what went wrong, and replace it with a pointless, silly message which can't be caught by the caller. Trying again may be impossible, or inappropriate, and certainly isn't up to the function to make that decision, that's up to the caller to decide what is the appropriate response to invalid data. I suppose I should've replaced the print() call with # Whatever recovery/handling code you need here My intention was to remove the bit about checking for an integer away from the spot that was checking it, out into an exception handler where it belongs. I was also under the (mistaken?) impression that the use case was an interactive type call, and used something like: supposed_integer = raw_input(Please enter an integer: ) # exception handling here But yes, if you're writing code that is meant to be called by someone else then that code is horrible, and exactly the wrong pattern to follow. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using multiprocessing efficiently to process large data file
On Thu, 30 Aug 2012, Abhishek Pratap wrote:
Hi Guys
I have a with few million lines. I want to process each block of 8
lines and from my estimate my job is not IO bound. In other words it
takes a lot more time to do the computation than it would take for
simply reading the file.
I am wondering how can I go about reading data from this at a faster
pace and then farm out the jobs to worker function using
multiprocessing module.
I can think of two ways.
1. split the split and read it in parallel(dint work well for me )
primarily because I dont know how to read a file in parallel
efficiently.
2. keep reading the file sequentially into a buffer of some size and
farm out a chunks of the data through multiprocessing.
As other folks have mentioned, having at least your general algorithm
available would make things a lot better.
But here's another way that you could iterate over the file if you know
exactly how many you have available (or at least a number that it's
divisible by):
with open('inputfile') as f:
for line1, line2, line3, line4 in zip(f,f,f,f):
# do your processing here
The caveat to this is that if your lines aren't evenly divisible by 4 then
you'll loose the last count % 4 lines.
The reason that this can work is because zip() combines several sequences
and returns a new iterator. In this case it's combining the file handles
f, which are themselves iterators. So each successive call to next() -
i.e. pass through the for loop - next() is successively called on f. The
problem of course is that when you reach the end of the file - say your
last pass through and you've only got one line left. Well, when zip's
iterator calls next on the first `f`, that returns the last line. But
since f is now at the end of the file, calling next on it will raise
StopIteration, which will end your loop without actually processing
anything on the inside!
So, this probably isn't the best way to handle your issue, but maybe it
is!
HTH,
Wayne
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Re: [Tutor] Why begin a function name with an underscore
On Mon, 27 Aug 2012, Richard D. Moores wrote:
On Mon, Aug 27, 2012 at 6:33 PM, Japhy Bartlett ja...@pearachute.com wrote:
something like:
def _validate_int(obj):
Raise an exception if obj is not an integer.
m = int(obj + 0) # May raise TypeError.
if obj != m:
raise ValueError('expected an integer but got %r' % obj)
is a really awkward way to test if something's an integer, and checking
types in general is usually a sign of larger flaws in laying out useful
code.
What the best way to test if something's an integer?
try:
whatever_you_want(supposed_integer)
except ValueError:
print(Oops, that wasn't an integer! Please try again)
That's usually the best way...
HTH,
Wayne
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Re: [Tutor] Script won't run for no apparent reason
On Fri, 10 Aug 2012, Dave Angel wrote: On 08/10/2012 03:53 PM, Joel Goldstick wrote: snip The clue was actually in his code. See his shebang line -- he's using Python 3. So the error is on the data that the user inputs. The other clue, that I noticed, was that his innermost error was on line 1, called from input(). Anyway, the cure is to use raw_input() everywhere instead. Or alternatively, if you want to write forward-looking code: try: input = raw_input except NameError: pass # since we're using python 3+ -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] suggestion for an editor
On Fri, 20 Jul 2012, Steven D'Aprano wrote: Bala subramanian wrote: Friends, At present i write programs using vi editor. I am interested to change to something else. My specific need is that i want to select a portion/small segment of my program (for eg. a nested loop) and then monitor processing time it takes for that portion while i run the program. By this i hope to find the segment that takes time and modify to achieve better speed. Can someone please share their experience. I don't think that what you want exists. As far as I know, even full-featured IDEs (Integrated Development Environments) don't include profiling of selected sections of code. It *would* be possible with a programmers editor (like Vim/Emacs) to write a macro or some type of extension to mark a block of code and have it profiled for you. But this would most likely consist of taking the exising code, finding the place where it's called in your application, and replacing that with a call through timeit, executing the app, and then removing the code (or do that in a temp file). But you could also write a fairly simple Python script to do that for you, without any type of IDE integration. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] string to binary and back... Python 3
I'll preface my response by saying that I know/understand fairly little about it, but since I've recently been smacked by this same issue when converting stuff to Python3, I'll see if I can explain it in a way that makes sense. On Wed, 18 Jul 2012, Jordan wrote: OK so I have been trying for a couple days now and I am throwing in the towel, Python 3 wins this one. I want to convert a string to binary and back again like in this question: Stack Overflow: Convert Binary to ASCII and vice versa (Python) http://stackoverflow.com/questions/7396849/convert-binary-to-ascii-and-vice-versa-python But in Python 3 I consistently get some sort of error relating to the fact that nothing but bytes and bytearrays support the buffer interface or I get an overflow error because something is too large to be converted to bytes. Please help me and then explian what I am not getting that is new in Python 3. I would like to point out I realize that binary, hex, and encodings are all a very complex subject and so I do not expect to master it but I do hope that I can gain a deeper insight. Thank you all. The way I've read it - stop thinking about strings as if they are text. The biggest reason that all this has changed is because Python has grown up and entered the world where Unicode actually matters. To us poor shmucks in the English speaking countries of the world it's all very confusing becaust it's nothing we have to deal with. 26 letters is perfectly fine for us - and if we want uppercase we'll just throw another 26. Add a few dozen puncuation marks and 256 is a perfectly fine amount of characters. To make a slightly relevant side trip, when you were a kid did you ever send secret messages to a friend with a code like this? A = 1 B = 2 . . . Z = 26 Well, that's basically what is going on when it comes to bytes/text/whatever. When you input some text, Python3 believes that whatever you wrote was encoded with Unicode. The nice thing for us 26-letter folks is that the ASCII alphabet we're so used to just so happens to map quite well to Unicode encodings - so 'A' in ASCII is the same number as 'A' in utf-8. Now, here's the part that I had to (and still need to) wrap my mind around - if the string is just bytes then it doesn't really matter what the string is supposed to represent. It could represent the LATIN-1 character set. Or UTF-8, -16, or some other weird encoding. And all the operations that are supposed to modify these strings of bytes (e.g. removing spaces, splitting on a certain character, etc.) still work. Because if I have this string: 9 45 12 9 13 19 18 9 12 99 102 and I tell you to split on the 9's, it doesn't matter if that's some weird ASCII character, or some equally weird UTF character, or something else entirely. And I don't have to worry about things getting munged up when I try to stick Unicode and ASCII values together - because they're converted to bytes first. So the question is, of course, if it's all bytes, then why does it look like text when I print it out? Well, that's because Python converts that byte stream to Unicode text when it's printed. Or ASCII, if you tell it to. But Python3 has converted all(?) of those functions that used to operate on text and made them operate on byte streams instead. Except for the ones that operate on text ;) Well, I hope that's of some use and isn't too much of a lie - like I said, I'm still trying to wrap my head around things and I've found that explaining (or trying to explain) to someone else is often the best way to work out the idea in your own head. If I've gone too far astray I'm sure the other helpful folks here will correct me :) HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Problem When Iterating Over Large Test Files
Just a few notes...
On Wed, 18 Jul 2012, Ryan Waples wrote:
snip
import glob
my_in_files = glob.glob ('E:/PINK/Paired_End/raw/gzip/*.fastq')
for each in my_in_files:
#print(each)
out = each.replace('/gzip', '/rem_clusters2' )
#print (out)
INFILE = open (each, 'r')
OUTFILE = open (out , 'w')
It's slightly confusing to see your comments left-aligned instead of with the
code they refer to. At first glance it looked as though your block ended here,
when it does, in fact, continue.
# Tracking Variables
Reads = 0
Writes = 0
Check_For_End_Of_File = 0
#Updates
print (Reading File: + each)
print (Writing File: + out)
# Read FASTQ File by group of four lines
while Check_For_End_Of_File == 0:
This is Python, not C - checking for EOF is probably silly (unless you're
really checking for end of data) - you can just do:
for line in INFILE:
ID_Line_1 = line
Seq_line = next(INFILE) # Replace with INFILE.next() for Python2
ID_Line_2 = next(INFILE)
Quality_Line = next(INFILE)
# Read the next four lines from the FASTQ file
ID_Line_1 = INFILE.readline()
Seq_Line= INFILE.readline()
ID_Line_2 = INFILE.readline()
Quality_Line= INFILE.readline()
# Strip off leading and trailing whitespace characters
ID_Line_1 = ID_Line_1.strip()
Seq_Line= Seq_Line.strip()
ID_Line_2 = ID_Line_2.strip()
Quality_Line= Quality_Line.strip()
Also, it's just extra clutter to call strip like this when you can just tack it
on to your original statement:
for line in INFILE:
ID_Line_1 = line.strip()
Seq_line = next(INFILE).strip() # Replace with INFILE.next() for Python2
ID_Line_2 = next(INFILE).strip()
Quality_Line = next(INFILE).strip()
Reads = Reads + 1
#Check that I have not reached the end of file
if Quality_Line == :
#End of file reached, print update
print (Saw + str(Reads) + reads)
print (Wrote + str(Writes) + reads)
Check_For_End_Of_File = 1
break
This break is superfluous - it will actually remove you from the while loop -
no further lines of code will be evaluated, including the original `while`
comparison. You can also just test the Quality_Line for truthiness directly,
since empty string evaluate to false. I would actually just say:
if Quality_Line:
#Do the rest of your stuff here
#Check that ID_Line_1 starts with @
if not ID_Line_1.startswith('@'):
print (**ERROR**)
print (each)
print (Read Number + str(Reads))
print ID_Line_1 + ' does not start with @'
break #ends the while loop
# Select Reads that I want to keep
ID = ID_Line_1.partition(' ')
if (ID[2] == 1:N:0: or ID[2] == 2:N:0:):
# Write to file, maintaining group of 4
OUTFILE.write(ID_Line_1 + \n)
OUTFILE.write(Seq_Line + \n)
OUTFILE.write(ID_Line_2 + \n)
OUTFILE.write(Quality_Line + \n)
Writes = Writes +1
INFILE.close()
OUTFILE.close()
You could (as long as you're on 2.6 or greater) just use the `with` block for
reading the files then you don't need to worry about closing - the block takes
care of that, even on errors:
for each in my_in_files:
out = each.replace('/gzip', '/rem_clusters2' )
with open (each, 'r') as INFILE, open (out, 'w') as OUTFILE:
for line in INFILE:
# Do your work here...
A few stylistic points:
ALL_CAPS are usually reserved for constants - infile and outfile are perfectly
legitimate names.
Caps_In_Variable_Names are usually discouraged. Class names should be CamelCase
(e.g. SimpleHTTPServer), while variable names should be lowercase with
underscores if needed, so id_line_1 instead of ID_Line_1.
If you're using Python3 or from __future__ import print_function, rather than
doing OUTFILE.write(value + '\n') you can do:
print(value, file=OUTFILE)
Then you get the \n for free. You could also just do:
print(val1, val2, val3, sep='\n', end='\n', file=OUTFILE)
The end parameter is there for example only, since the default value for end is
'\n'
HTH,
Wayne
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Re: [Tutor] suggestion for an editor
On Thu, 19 Jul 2012, Bala subramanian wrote: Friends, At present i write programs using vi editor. I am interested to change to something else. My specific need is that i want to select a portion/small segment of my program (for eg. a nested loop) and then monitor processing time it takes for that portion while i run the program. By this i hope to find the segment that takes time and modify to achieve better speed. Can someone please share their experience. I'm not sure how vi has anything to do with the speed of your program(!) For performance measurements you should look into the Timeit module. How long does it take your program to run currently? After all, premature optimisation is the root of all evil... -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] passing global variable as argument.
On Mon, 16 Jul 2012, Bala subramanian wrote: Friends, I want to define a function that can populate an array by taking its name (which is defined globally). Are you sure this is what you really want to do? I've noticed that many times that I want to do something, but only because I don't understand how to do it a better way. I defined two empty arrays as follows and a function that can populate the array. REF_F1=np.array([]) REF_F2=np.array([]) # populating the given array def ref(ln,REF_F1): global REF_F1 My command of the global syntax is a little weak, but I'm going to say what is probably happening with this line is that you are telling python you now want to refer to the REF_F1 that lives in the global namespace, not the one that was passed in to your function. REF_F1=np.zeros((ln,3),dtype='float32') This line here tells me that what I mentioned first is correct. You don't care *what* the array is before hand, because you're actually zeroing the array. Read the conclusion below. for i in range(ln): for j in range(3): REF_F1x[i,j]=resid[Index[i]].cent()[j] I'm not sure what `resid` or `Index` are. Also, REF_F1x wasn't defined anywhere so you're probably getting a name error here. When sending code, especially misbehaving code, the best thing to do is provide a SMALL, but complete program that can be run on its own, as long as one has the dependencies. ref(ln, REF_F2) In this case, when i pass REF_F2 as argument, the fn. always populates array REF_F1. I also tried something like the following *def ref(ln,x=REF_F1)* and then calling as *ref(ln,x=REF_F2)*. The result is the same. Could someone please give me hint on how pass global variables as arguments. First off, the whole point of global variables are so that you don't have to pass them as arguments. This is fine, and there are occasions where you legitimately want to have a global variable - but this isn't one of them. When you use globals improperly, they cause maintenance nightmares by making it really hard to figure out what's going on in your code. At least Python requires you to explicitly state that you care about some global value with the global keyword. But in this case it looks like you don't actually care about the original array - you're completely replacing the values based on whatever the value of `ln` is. So instead you could do something like def initialize_array(ln): new_array = np.zeros((ln,3),dtype='float32') for i in range(ln): for j in range(3): new_array[i,j]=resid[Index[i]].cent()[j] return new_array And then you would call it like this: REF_F2 = ref(ln) HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] newbie Questions
On Mon, 16 Jul 2012, Walter Prins wrote: Hi again Matthew, I forgot to include the following link which I originally thought to include, which is one guy's set of (IMHO very cogent) criticisms against PHP as programming language: http://is.gd/z1POXC Hopefully it gives you something else to think about regarding the PHP vs Python question apart from just whether doing websites in it is easy. I read that article recently and recommend it as well. I used to think that PHP was just fine... but since reading that article (and several related ones), I've since revised my opinion. I would now tell someone to learn any language besides php. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] str object is not callable
On Wed, 11 Jul 2012, Steven D'Aprano wrote: Chris Hare wrote: Okay - I am officially embarrassed. [...] Meh, don't beat yourself up too badly. We've all been where you are now. Sometimes I look back at my early Python code... I tell you, that's always a good antidote for a big head. I read a marvelous quote today: Good code is anything I wrote today. Bad code is anything I wrote more than a week ago. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] updating step size while in loop
While you can't do it with a straight generator, you can create your own: class MyIter: def __init__(self, start, stop, step=1): self.start = start self.stop = stop self.step = step def __iter__(self): self.cur = self.start while self.cur self.stop: yield self.cur self.cur += 1 And then you could do the following: In [36]: i = MyIter(1, 10) In [37]: for x in i: : if x % 2: : i.cur += 1 : print(x) : 1 3 5 7 9 -HTH, Wayne On Tue, 10 Jul 2012, Hugo Arts wrote: On Mon, Jul 9, 2012 at 11:59 PM, Abhishek Pratap abhishek@gmail.com wrote: hey guys I want to know whether it is possible for dynamically update the step size in xrange or someother slick way. Here is what I am trying to do, if during a loop I find the x in list I want to skip next #n iterations. for x in xrange(start,stop,step): if x in list: step = 14 else: step = 1 Thanks! -Abhi It is not possible with a range object. You'll have to make a while loop and keep track of the step yourself. Hugo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Simple Python Address Book (Advice welcome!)
On Sun, 17 Jun 2012, Alan Gauld wrote:
On 17/06/12 02:45, mariocatch wrote:
after each row?
#it's causing multiple line separations when writing back out
to file (because each
# time we finish reading, it ends with a trailing newline).
f.write({0}{1}{2}\n.format(k, recordDelimiter, v))
Sorry, you have to add a newline when writing to the file and strip it off
when reading. Its just how it is...
If you're using Python3 or from __future__ import print_function, you can do
this
print(k,v, sep=recordDelimiter, file=f)
Which might make things a little cleaner. There's also the end parameter which
defaults to end='\n'
HTH,
Wayne
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Re: [Tutor] creating a regularly placed fields in a line
On Wed, 25 Apr 2012, Prasad, Ramit wrote: snip Useful to know both though, since lots of people swear by % substitution. And % formatting is slightly faster - if you end out doing tons of formatting and you find your script isn't fast enough, it's worth taking a look there. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Readabilty vs 80 characters
On Thu, 19 Apr 2012, Tino Dai wrote: Hi! I have a question about style. In PEP-8, it says don't exceed 79 characters, but can this rule ever be trumped by readability? PEP 8 is style guidelines, not hard and fast rules or they wouls be syntax errors. But that would just be annoying, so yes, there are cases where you would want to extend... Eg. if someobject.filter(something) \ .filter(somethingreallyreallyreallyreallylong == somethingelsereallyreallylong) \ .filter(othethingreallylongreallyreally == ternarythingreallyreallyreallylong) \ .filter(thirdthingreallylessreallymaybelong == thirdotherthingreallylong) \ .first(): do something if someobject.filter(something) \ .filter(somethingreallyreallyreallyreallylong == \ somethingelsereallyreallylong) \ .filter(othethingreallylongreallyreally == \ ternarythingreallyreallyreallylong ) \ .filter(thirdthingreallylessreallymaybelong == \ thirdotherthingreallylong) \ .first(): do something The first example is more readable to me but violates the 80 character rule. The second is less readable, but doesn't violate the 80 character rule. This is exactly what the style guide is meant to help. Regardless of which format you chose here I would tell you that both ways are wrong. The right way is to fix your algorithm (how you solve the problem) so you don't have to have such an insane amount of code on one line. Of course this isn't a hard and fast rule either, but I'd say about 99% of the time a lot of nesting or chaining indicates a broken flow (even if the logic is 100% accurate). Is there a guideline or convention that pythonistas follow about this style case? Refactor! hth, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] regex question
On Fri, 6 Apr 2012, Khalid Al-Ghamdi wrote:
hi all,
I'm trying to extract the domain in the following string. Why doesn't my
pattern (patt) work:
redata
'Tue Jan 14 00:43:21 2020::eax...@gstwyysnbd.gov::1578951801-6-10 Sat Jul 31
15:17:39 1993::rz...@wgxvhx.com::744121059-5-6 Mon Sep 21 20:22:37
1987::ttw...@rpybrct.edu::559243357-6-7 Fri Aug 2 07:15:23
1991::t...@mgfyitsks.net::681106523-4-9 Mon Mar 18 19:59:47
2024::dgz...@fhyykji.org::1710781187-6-7 '
patt=r'\w+\.\w{3}(?=@)'
re.findall(patt,redata)
[]
This pattern works but the first should, too. shouldn't it?
The all too familiar quote looks like it applies here: Often programmers,
when faced with a problem, think 'Aha! I'll use a regex!'. Now you have
two problems.
It looks like you could easily split this string with redata.split('::')
and then look at every second element in the list and split *that* element
on the last '.' in the string.
With data as well-formed as this, regex is probably overkill.
HTH,
Wayne
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Re: [Tutor] New to Python programing
On Mon, 2 Apr 2012, wesley chun wrote: greetings walter, and welcome to the Python family! snip as far as books go, the best way to learn Python is by writing games. this is an approach that works both with children as well as adults. there are several excellent books that can help you with this regard: There is another book that I didn't notice mentioned: Game Programming: The L line, the express line to learning. The book is unfortunately named because it makes no mention of Python, but it's quite a good book for learning both programming and Python... and games! Good luck and welcome to Python! -Wayne Werner ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] breeds of Python .....
On Sat, 31 Mar 2012, Modulok wrote: If you're just starting out, go with 3.x. If you have a need for some third party modules that aren't yet available for 3.x, you'll have to stick with 2.x. For a handy list, check out the Python3 Wall of Shame (soon to be superpowers?) http://python3wos.appspot.com/ HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] feedback on writing pipelines in python
On Wed, 21 Mar 2012, Abhishek Pratap wrote: Hi Guys I am in the process of perl to python transition for good. Welcome! 1. stitch pipelines : I want python to act as a glue allowing me to run various linux shell based programs. If needed wait for a program to finish and then move on, logs if required You'll want to take a look at the subprocess module. One thing you will notice is that Perl has a lot more terse syntax when it comes to commands line integration. That being said, Python is still fully capable. You may want to check out an Oreilly book called Python for the system administrator by Noah Gift. It doesn't tell you much about each tool but it exposes you to a ton of them. HTH, Wayne___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] help writing functions
On Thu, 23 Feb 2012, Saad Javed wrote: I am learning python and need guidance for writing some code. I've written a simple program (with pointers from people) that parses an tv show xml feed and prints their values in plain text after performing some string operations. Unless you're really interested in doing this fire the sake of the exercise you should probably take a look at feedparser it's designed for parsing read and atom feeds. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On Wed, Jan 18, 2012 at 6:00 AM, Selwyn Mileham smile...@vodamail.co.zawrote: Help someone Trying to print to printer using python 3.2.2 Get error load dll error can’t find win32print. It is in site library What have you tried? If you get an exception, please post the exact text of the traceback. If the code you used is short enough then it's reasonable to just paste it in your email (make sure HTML formatting is off, though, because it will probably break the formatting). -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Reg. Expressions Parenthesis
On Tue, Jan 17, 2012 at 3:07 AM, Chris Kavanagh cka...@msn.com wrote:
Hey guys, girls, hope everyone is doing well.
Here's my question, when using Regular Expressions, the docs say when
using parenthesis, it captures the data. This has got me confused
(doesn't take much), can someone explain this to me, please??
Here's an example to use. It's kinda long, so, if you'd rather provide
your own shorter ex, that'd be fine. Thanks for any help as always.
Here's a quick example:
import re
data = 'Wayne Werner fake-phone: 501-555-1234, fake-SSN: 123-12-1234'
parsed = re.search('([\d]{3})-([\d]{3}-[\d]{4})', data)
print(parsed.group())
print(parsed.groups())
parsed = re.search('[\d]{3}-[\d]{3}-[\d]{4}', data)
print(parsed.group())
print(parsed.groups())
You'll notice that you can access the individual clusters using the
.groups() method. This makes capturing the individual groups pretty easy.
Of course, capturing isn't just for storing the results. You can also use
the captured group later on.
Let's say, for some fictitious reason you want to find every letter that
appears as a double in some data. If you were to do this the brute force
way you'd pretty much have to do something like this:
for i in range(len(data)-1):
found = []
if data[i] == data[i+1]:
if not data[i] in found:
found.append(i)
print(found)
The regex OTOH looks like this:
In [29]: data = 'aaabababbcacacceadbacdb'
In [32]: parsed = re.findall(r'([a-z])\1', data)
In [33]: parsed
Out[33]: ['a', 'b', 'c']
Now, that example was super contrived and also simple. Very few real-world
applications will be as simple as that one - usually you have much crazier
specifications, like find every person who has blue eyes AND blue hair, but
only if they're left handed. Assuming you had data that looked like this:
NameEye ColorHair Color Handedness Favorite type of potato
WayneBlue BrownDexter Mashed
Sarah Blue Blonde SinisterSpam(?)
Kane Green White Dexter None
Kermit Blue Blue SinisterIdaho
You could parse out the data using captures and backrefrences [1].
HTH,
Wayne
[1] In this situation, of course, regex is overkill. It's easier to just
.split() and compare. But if you're parsing something really nasty like EDI
then sometimes a regex is just the best way to go[2].
[2] When people start to understand regexes they're like the proverbial man
who only has a hammer. As Jamie Zawinski said[3], Some people, when
confronted with a problem, think
“I know, I'll use regular expressions.” Now they have two problems. I've
come across very few occasions that regexes were actually useful, and it's
usually extracting very specifically formatted data (money, phone numbers,
etc.) from copious amounts of text. I've not yet had a need to actually
process words with it. Especially using Python.
[3]http://regex.info/blog/2006-09-15/247
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Re: [Tutor] Return to my python26.dll python.dll problems on bootup
You are right about posting here, but I was hoping someone might have related to the problem. I went to the WinAmp forum for help. But who would have guessed that WinAmp would have provided a program not ready for prime time, and nothing buy an advertisement to get you to buy the latest drivers for your PC. Lesson learned. Someone on their forum suggested hijackthis.log, which will fix a registry. Five stars by CNET, but it may not be quite free. Ah, I just got through to uniblue's tech support by mail. As an aside, I've noticed that a lot of downloadable freebies have pages that are thick with other $ products advertising. Once you get through several pages of them, you then find the download. On 1/5/2012 10:25 AM, Steven D'Aprano wrote: Wayne Watson wrote: I have two problems upon bootup of my Win7 PC, 64-bit. Wayne, I sympathize with your problems, but they are Windows problems, not Python problems, and have absolutely nothing to do with learning to program Python. You are spamming this mailing list with off-topic questions about fixing your Windows system. This list is about learning Python programming, not we'll fix any problem that has some vague connection to Python, no matter how slight. Have you tried asking for help on Windows-related forums or mailing lists? It has been many years since I've used Windows regularly, but I can tell you this: you don't do yourself any favours by installing and uninstalling programs under Windows. I know it is less than helpful, but my advice is *never* install any program you aren't sure you will want to keep, because uninstalling always leaves traces of crud behind, eventually leading to exactly the sorts of problems you are experiencing. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] question about a exercise
On Thu, Jan 5, 2012 at 9:22 AM, daedae11 daeda...@126.com wrote: ** The exercise is: Write a function which has 3 parameters. First parameter is a char, second parameter is a integer, third parameter is a integer. The function would create a file which have following requests: 1. the length of the file is in accordance with the third parameter. 2. the content of the file must be random generated. 3. the time first parameter occurred in the content must be in accordance with second parameter. please give me some hints. It would be better if you give me the code. It would be better if /you/ gave us the code that shows what you've tried. Also, if we give you the solution(s) then you won't learn. To accomplish this exercise you need a few skills: 1. Write a function that takes parameters - can you do this? 2. Create a file - can you do this? 3. Generate random text - can you do this? 4. Modify text (or generate slightly less-random text) - can you do this? If you can do those four things then you should be able to easily accomplish this task (that looks an awful lot like homework) HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Return to my python26.dll python.dll problems on bootup
I have two problems upon bootup of my Win7 PC, 64-bit. 1. This may or may not be related to #2, which is the more important of the two, I think. C:\Program Files9x86)\Uniblue\DriverScanner\Python26.dll not installed. What is Uniblue you ask? I installed a new version of the video program Winamp back in early Nov, and it had some selections. One of which was to include Uniblue Driver Checker. I thought I'd give it a try. After the install completed, I thought I'd give it a try. It goes through all your drivers to find which ones are out of date. Surprise. You can buy the latest ones through them. I uninstalled Uniblue, but as it turns out, it was an incomplete uninstall. I spent the 30-45 minutes trying to get it uninstalled. Finally, I sent an e-mail on how to do it to them. Never got an answer. Next is Winamp. I have no idea how it got entangled with Python 2.6. 2. This appears too: Specified module could not be found:Module could not be found. Load Lib, python.dll Python works fine. What's the problem? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39 15' 7" N, 121 2' 32" W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- "The Date" The mystery unfolds. Web Page: www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Which libraries for Python 2.5.2 [SOLVED]
This problem was solved when my wife noticed that there was a second install disk for the 5 year old XP zx6000 PC she had given me, which I will now give to a friend. The problem originally was a missing dll that Python wanted. All is well now. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
On 12/24/2011 11:24 AM, Alan Gauld wrote: On 24/12/11 18:58, Wayne Watson wrote: Yikes. I gave the permissions for .idlerc above. The problem is with recent-files.py. IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' Can you open it in Notepad from the same command prompt? ie. is it just idle that can't open it, or is it any program? Opens with Notepad and jEdit from the menu off a py file. I'm suspicious of the Unknown Account(S-1-21-lots of digits) seen in Properties' Security tab. It seems bizarre and has read and readexecute properties only. Unknown User exits for txt and jpg files, so it's not isolated to py. Perhaps there's an ownership problem; however, Owner (recent-files.lst) is: solarblast\Wayne. That's me. I'm looking at the General tab of .idlerc. Attributes Read-only check box is blue. If I click on it, it goes white. If I click again, it shows the check mark. Eventually, I get back to blue. I'm now looking at Properties-General for recent-files.lst, and Read -only check box is white. Presently, I do not know if this amounts to anything. I see recent-files.lst is openable with Word. I see mydir_math.py is opened with python.exe!!?? True of other py files. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [SOLVED]
Excellent strategy!! It worked. I just examined the properties for each .idlerc, and noticed that the troublesome one was created in Feb 4,2010. Probably with Python 2.5.2. I don't know why or necessarily whether new installs shouldn't have changed the folder or recreated it. Thanks to all who followed this long perplexing thread. On 12/24/2011 8:08 PM, Lie Ryan wrote: On 12/25/2011 06:24 AM, Alan Gauld wrote: On 24/12/11 18:58, Wayne Watson wrote: Yikes. I gave the permissions for .idlerc above. The problem is with recent-files.py. IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' Can you open it in Notepad from the same command prompt? ie. is it just idle that can't open it, or is it any program? also, try deleting the whole folder (or just in case, move the folder somewhere else), IDLE should create a new folder and config files, hopefully with the correct permission. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Which libraries for Python 2.5.2
Yes, that's a reasonable request, and I expected it, but hoped it might be apparent from what I revealed. Why? It's on another PC this happened, and getting the messages of it is not easily done, but today I have time, so soon I will post the details. On 12/24/2011 10:49 AM, Hugo Arts wrote: On Sat, Dec 24, 2011 at 6:37 PM, Wayne Watson sierra_mtnv...@sbcglobal.net wrote: I'm trying to restore Python 2.5.2 on an old PC for a particular application that uses it from 4-5 years ago. According to the latest manual on it, the following should be installed. python-2.5.2.msi PIL-1.1.6.win32-py2.5.exe numpy-1.1.0-win32-superpack-python2.5.exe matplotlib-0.98.1.win32-py2.5.exe When I install them, and try to run the app program, Sentinel.py, some part of matplotlib complains (error msgs) and the program quits. If we are to give any kind of useful advice at all, we're going to need to see those error messages. The program begins with: from Tkinter import * from numpy import * import Image import ImageChops import ImageTk import time import binascii import tkMessageBox import tkSimpleDialog from pylab import plot, xlabel, ylabel, title, show, xticks, bar I tried numpy-1.2.0 and matplotlib-0.98.3 and had the same difficulty. What are wiser choices? This question is based on the assumption that version mismatch is the cause of your problems. Even though that might be correct, it is not an assumption you can safely make. In general, when asking questions here (and anywhere really, imho) you should try to provide as much factual information and as little conjecture as you can. Hugo -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Which libraries for Python 2.5.2
Here's the traceback. Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. Personal firewall software may warn about the connection IDLE makes to its subprocess using this computer's internal loopback interface. This connection is not visible on any external interface and no data is sent to or received from the Internet. IDLE 1.2.2 No Subprocess Traceback (most recent call last): File C:\Sentinel\Sent_user-20080716.py, line 16, in module from pylab import plot, xlabel, ylabel, title, show, xticks, bar File C:\Python25\lib\site-packages\pylab.py, line 1, in module from matplotlib.pylab import * File C:\Python25\lib\site-packages\matplotlib\pylab.py, line 206, in module from matplotlib import mpl # pulls in most modules File C:\Python25\lib\site-packages\matplotlib\mpl.py, line 1, in module from matplotlib import artist File C:\Python25\lib\site-packages\matplotlib\artist.py, line 4, in module from transforms import Bbox, IdentityTransform, TransformedBbox, TransformedPath File C:\Python25\lib\site-packages\matplotlib\transforms.py, line 34, in module from matplotlib._path import affine_transform ImportError: DLL load failed: The specified module could not be found. On 12/26/2011 11:44 AM, Wayne Watson wrote: Yes, that's a reasonable request, and I expected it, but hoped it might be apparent from what I revealed. Why? It's on another PC this happened, and getting the messages of it is not easily done, but today I have time, so soon I will post the details. On 12/24/2011 10:49 AM, Hugo Arts wrote: On Sat, Dec 24, 2011 at 6:37 PM, Wayne Watson sierra_mtnv...@sbcglobal.net wrote: I'm trying to restore Python 2.5.2 on an old PC for a particular application that uses it from 4-5 years ago. According to the latest manual on it, the following should be installed. python-2.5.2.msi PIL-1.1.6.win32-py2.5.exe numpy-1.1.0-win32-superpack-python2.5.exe matplotlib-0.98.1.win32-py2.5.exe When I install them, and try to run the app program, Sentinel.py, some part of matplotlib complains (error msgs) and the program quits. If we are to give any kind of useful advice at all, we're going to need to see those error messages. The program begins with: from Tkinter import * from numpy import * import Image import ImageChops import ImageTk import time import binascii import tkMessageBox import tkSimpleDialog from pylab import plot, xlabel, ylabel, title, show, xticks, bar I tried numpy-1.2.0 and matplotlib-0.98.3 and had the same difficulty. What are wiser choices? This question is based on the assumption that version mismatch is the cause of your problems. Even though that might be correct, it is not an assumption you can safely make. In general, when asking questions here (and anywhere really, imho) you should try to provide as much factual information and as little conjecture as you can. Hugo -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Regardless, the problem is solved. See my [SOLVED] msg I put up this morning (USA). It's in response to Lie Ryan. However, I have no real idea how is was caused. On 12/26/2011 1:28 PM, Alan Gauld wrote: On 26/12/11 18:57, Wayne Watson wrote: IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' Can you open it in Notepad from the same command prompt? Opens with Notepad and jEdit from the menu off a py file. That's not what I asked. Does it open in Notepad from the same command prompt where you try to run python? Or indeed any command prompt: C:\WINDOWS notepad C:\Users\Wayne\.idlerc\recent-files.lst I see recent-files.lst is openable with Word. Thats nort a surprise, its probably just a text file, so Windows could associate just about anything! I see mydir_math.py is opened with python.exe!!?? True of other py files. Which is what you'd expect, after all the default behaviour for a python script should surely be to get executed by Python? What else would you expect? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
My guess is that some months ago I looked at .idlerc on another mission to figure what ails my python install, and just more or less backed up the recent-files.lst. However, the important point here is, I think, how to change the permissions for the .idlerc folder. They vary by how I might login. On 12/23/2011 11:47 PM, Lie Ryan wrote: On 12/23/2011 03:20 PM, Wayne Watson wrote: Hi, I found it, but not in a place I would expect. It's under my username, Wayne. It is a folder and has three files: breakpoints.lst recent-files.lst ZZrecent-files.lst The last one has the odd ZZ, but is empty. breakpoints.lst is empty too. That certainly is curious, have you tried renaming ZZrecent-files.lst to recent-file.lst? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Which libraries for Python 2.5.2
I'm trying to restore Python 2.5.2 on an old PC for a particular application that uses it from 4-5 years ago. According to the latest manual on it, the following should be installed. python-2.5.2.msi PIL-1.1.6.win32-py2.5.exe numpy-1.1.0-win32-superpack-python2.5.exe matplotlib-0.98.1.win32-py2.5.exe When I install them, and try to run the app program, Sentinel.py, some part of matplotlib complains (error msgs) and the program quits. The program begins with: from Tkinter import * from numpy import * import Image import ImageChops import ImageTk import time import binascii import tkMessageBox import tkSimpleDialog from pylab import plot, xlabel, ylabel, title, show, xticks, bar I tried numpy-1.2.0 and matplotlib-0.98.3 and had the same difficulty. What are wiser choices? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Permissions as follows: SYSTEM: All. From Full control to write Account Unknown(S-1-5-21...): read, exec, list folder contents, Read Wayne: (normal use) All. From Full control to write Admin: All. From Full control to write WMPNetwork: Read -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Yikes. I gave the permissions for .idlerc above. The problem is with recent-files.py. IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' These are for it. Same as before except for Account Unknown, which had list folder contents. Permissions as follows: SYSTEM: All. From Full control to write Account Unknown(S-1-5-21...): readexec, Read Wayne: (normal use) All. From Full control to write Admin: All. From Full control to write WMPNetwork: Read -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Unable to remove three libs from XP
I have three py libs and the python program itself, 2.52, installed on an 6 year old HP Laptop. I decided to remove them, and removed Python with the Control Panel Add/Remove icon. Worked fine. When I tried to remove any of the remaining libs, press the add/remove button does nothing but blink. How do I get around this problem? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Unable to remove three libs from XP
This is a laugher. The Add/Remove screen was hiding a dialog that wanted to know if I really wanted to remove the program. Argh. On 12/23/2011 4:56 AM, Wayne Watson wrote: I have three py libs and the python program itself, 2.52, installed on an 6 year old HP Laptop. I decided to remove them, and removed Python with the Control Panel Add/Remove icon. Worked fine. When I tried to remove any of the remaining libs, press the add/remove button does nothing but blink. How do I get around this problem? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Hi, Walter. On 12/21/2011 8:20 PM, Walter Prins wrote: Hi Wayne, On 22 December 2011 03:21, Wayne Watsonsierra_mtnv...@sbcglobal.net wrote: I uninstalled Uniblue, but as it turns out, it was an incomplete uninstall. I just spent the last 30-45 minutes trying to get it uninstalled. Finally, I sent an e-mail on how to do it. I have no idea how it got entangled with Python 2.6. So for the time being it's out of the picture. Well, presumably it uses/depends on Python 2.6... I'm looking at the Uniblue DriverScanner, and see mostly exe files, and a few dll files. They may all relate to the uniblue program itself. There's a language folder there, and a x64 folder there. x64 has the installer. Otherwise, there is no reference to anything that looks like a 26 dll, nor is there a list of drivers the program might want to examine for age. Of course, all of this should have been uninstalled. Although, the Win7 indexed search is very fast to find something there are times when it flubs (possibly since I don't know all the tricks one can use in a search). looking for 26.dll has turned up nothing an either a folder or inside a file. Supposedly, Uniblue supply an answer in 24 hours. If not, I'll try Winamp. As a question asked by others, is Python27 under ...\System32. It is under C:\Python27. Further, it is the 64-bit version associated with Python. I didn't ask. I stated, and to clarify: When you install the standard distribution of Python, the majority of the files get put under C:\PythonNN (unless otherwise specified by the user). However, the Python engine in the form of a DLL is *also* put under the System32 directory. I'm looking at System32 entries right now. I see folders such as spool, speech, setup,restore, and lots of dll files. Some of the p dll files are p2psvc.dll, packager.dll, p2p.dll, and python27.dll. No python26.dll, and nothing starting with py other than the 27 file. In reading some of the other posts, I was unsure of whether Python27 is put on the PATH or not by the install. The question remains unanswered. I just left it there, as I re-installed 2.7.2 minutes ago. Here's where matters stand. I've already answered this also, with an unambigious exception to my answer pointed out by another poster, which is that it depends on whether you installed the standard Python distribution or whether you Standard. Interesting dependency. I considered Active once, but did not install it. installed the ActiveState Python distribution. So, did you install the standard Python distribution or did you install the ActiveState version of Python? The answer to this question will determine whether the PATH will have been affected by the Python installation. Even so, it's an irrelevance w.r.t. your IDLE problems... What is the outcome based on what I wrote about not Active? The fact that when I right click on a py file, it begins with Open and then Edit with IDLE is very encouraging. Having this entry in your context menu simply means certain entries are in your system's registery but says very little else about whether it will work or not. The downside is that IDLE does not come up. Which suggests that the associations/registry entries are in fact broken, perhaps because they're pointing to a non-existent installation of Python... If so, how I can I tell? However, the Start menu's Python27 entry shows Edit with IDLE, Manuals, ..., and Python Console. The console works. The fact that IDLE actually appears in both places is again encouraging. Does IDLE start from the Start menu when you click it? Nothing happens that I can detect. I'm looking at Properties of it. It shows Start in: c:\Python27. Type of File: shortcut (link). Location: ...\star menu\programs\python2.7 Interesting under the Security tab it shows Wayne with only special permissions. No Read, Write, Read Execute(!!). Admin allows all but special. Users allows ReadExecute and Read. Same with Everyone Under Details tab Name is IDLE(Python GUI) link. Folder Path: c:\ProgramData\Microsoft\Windows\Start... I can see nothing past Start... Under ...\Python27\Lib\idlelib, I can find idle.py, idle.pyw and IdleHistory.py. Clicking on idle.pyw does nothing. Does double clicking idle.pyw do anything? Nothing but a momentary circular arrow icon. Thinking I guess. Normally double clicking idle.pyw will start IDLE. Does double clicking idle.bat do anything? Normally clicking idle.bat will also start IDLE. If you open a command prompt and then enter cd \Python27\Lib\idlelib idle.bat Does it output any error messages? If so, what? A black command window comes up very briefly. It looks empty, but it's really gone quickly. A few months ago when I broached this install and IDLE problem, someone mentioned idle.bat. It is in the same idlelib. Is there something that needs to be done here, to get IDLE active? Is this where having Python27 in the path causes a problem with IDLE? Whether
Re: [Tutor] A few Python Mysteries
On 12/21/2011 4:10 PM, Alan Gauld wrote:
On 21/12/11 19:56, Wayne Watson wrote:
To clarify: Python on Windows does **not** put itself on the System
PATH when installed.
So, PythonNN, where NN is the version, should never appear in PATH?
Not from a standard Python installation.
But other programs whjich use Pythonn may install a version and modify
the PATH for you, or you may, for your own benefit, add it manually.
I always add a new Python version to my PATH as a matter of course.
It's conceivable when I raised some of the questions a month of so ago,
someone suggested putting PythonNN on the path.
Very possible indeed.
likely the application that *did* put it there is the **same**
application that is now complaining about the fact that it can't find
the Python 2.5 DLL when you boot up...
See my mis-copy 26.dll in my other post to you.
OK, But the principle remains. If you have an app in your startup
sequence that expects to find Python it will complain.
Per my new sub thread {Reset], Uniblue seems to the trouble maker with
26.dll.
You can check your startup sequence using a Microsoft tool.
MSCONFIG or somesuch. Google Windows startup tool or similar...
You can disable individual programs and restart to find out
what is causing it.
I see msconfig.exe, but at the moment am hesitant to use it.
I have no idea why some remnant of why Python6 is hanging around. I
uninstalled it long ago too.
The problem is that it is not hanging around and some app expects
it to be there. The error message is about a missing file...
One thing that may be significant...
Are you installing your Windows Python versions from
python.org or from ActiveState? They are very similar
but not identical.
from Python Org.
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet
CE 1955 October 20 07:53:32.6 UT
-- The Date The mystery unfolds.
Web Page:www.speckledwithstars.net/
___
Tutor maillist - Tutor@python.org
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Re: [Tutor] A few Python Mysteries [Reset]
I just searched the registry for the dll. Nothing. I then searched for python. It found a a Python folder with a PythonCore folder. Under it are three folders: 2.5, 2.7 and 3.2. I do recall installing 3.2, but I'm pretty sure I uninstalled it. Under each of the three folders is Module. Looking at the contents shows only default (name) REG_SZ (type) for each. Nothing else. OK,in scrolling around I see another Python folder and PythonCore under it, and subfolders 2.7 and 3.2. Under 2.7 are the subfolders Help, InstallPath, Modules, PythonPath. For 3.2, just an empty Modules. All of these are under SOFTWARE. The first set of three is under WOW6432Node, which is under SOFTWARE. Interesting, but it doesn't reveal much to me. For more fun, I searched for idle. It's buried under Interface, and the entry is REG_SZ with value idlesettings. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
More. I did some Googling on IDLE not appearing. My case appears not to be unique. One site offered this as a solution in 2.6, C:\Python27python.exe \Lib\idlelib\idle.py. It issued a complaint that no such file or directory exists. It however does. A place to go that may clear this up might be http://bugs.python.org/. I found the suggestion above there. There are other comments about this issue there, but I haven't sorted through all of them. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Ah, yes.Thanks. That is, I think, was the what I copied from some web page. OK, I just tried it, and got several messages. C:\Python27python.exe Lib\idlelib\idle.py Traceback (most recent call last): File Lib\idlelib\idle.py, line 11, in module idlelib.PyShell.main() File C:\Python27\Lib\idlelib\PyShell.py, line 1403, in main shell = flist.open_shell() File C:\Python27\Lib\idlelib\PyShell.py, line 279, in open_shell self.pyshell = PyShell(self) File C:\Python27\Lib\idlelib\PyShell.py, line 832, in __init__ OutputWindow.__init__(self, flist, None, None) File C:\Python27\Lib\idlelib\OutputWindow.py, line 16, in __init__ EditorWindow.__init__(self, *args) File C:\Python27\Lib\idlelib\EditorWindow.py, line 273, in __init__ self.update_recent_files_list() File C:\Python27\Lib\idlelib\EditorWindow.py, line 799, in update_recent_files_list rf_file = open(self.recent_files_path, 'w') IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' - Maybe as I pointed out a few msgs ago here the permissions shown on Properties looked a bit odd. On 12/22/2011 9:58 AM, Alan Gauld wrote: On 22/12/11 16:37, Wayne Watson wrote: C:\Python27python.exe \Lib\idlelib\idle.py. It issued a complaint that no such file or directory exists. It however does. It almost certainly doesn't. The \ in front of Lib says look in the root directory of the C drive. You probably need: C:\Python27 python.exe Lib\idlelib\idle.py. HTH -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
Hi, I found it, but not in a place I would expect. It's under my username, Wayne. It is a folder and has three files: breakpoints.lst recent-files.lst ZZrecent-files.lst The last one has the odd ZZ, but is empty. breakpoints.lst is empty too. recent-files.lst contains about 21 files like: C:\Users\Wayne\Sandia_Meteors\Trajectory_Estimation\radiant.py C:\Users\Wayne\Sandia_Meteors\Trajectory_Estimation\cross_prod.py ZZ... is the most recent file, 7/18/2011. If I right-click .idlerc, I can see properties for SYSTEM, some very oddly named user, Wayne, Admin, and WMPNetwork. On 12/22/2011 2:34 PM, Alan Gauld wrote: On 22/12/11 19:08, Wayne Watson wrote: IOError: [Errno 13] Permission denied: 'C:\\Users\\Wayne\\.idlerc\\recent-files.lst' - Maybe as I pointed out a few msgs ago here the permissions shown on Properties looked a bit odd. But the problem here is with .idlerc in your home directory. Can you find that file and ensure that read/write permissions are set? It may be a hidden file so you might have to tweak the View settings. .idelrc is presumably where Idle stores your local config settings. Although I confess I never noticed it when I used Windows. But then I probably never had a need to notice it! -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
Python is long gone from my system. I only have Python 27. Somewhere a long the line, the uninstall of Python5 probably did not remove the Python5 from the PATH. I have no explanation as to why Python7 was not in the PATH. I have no idea why some remnant of why Python6 is hanging around. I uninstalled it long ago too. On 12/21/2011 2:43 AM, Steven D'Aprano wrote: Wayne Watson wrote: I changed Python25 to Python27, and rebooted. I got the same two dll msgs again. I suggest you find out what applications are trying to run using Python 2.5. This is a Windows problem -- you need to get the list of programs that run at start up and inspect them for something that uses Python. Since I don't use Windows, I can't be more specific. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
Howdy, On 12/21/2011 2:08 AM, Walter Prins wrote: Hi Wayne, On 21 December 2011 02:32, Wayne Watsonsierra_mtnv...@sbcglobal.net wrote: I changed Python25 to Python27, and rebooted. I got the same two dll msgs again. The PATH issue has nothing to do with your error messages. True, but it should have a lot to do with Python27. Some good news is that unlike previous attempts, I can actually see IDLE as a choice on a right-click of a py file. However, a spinner icon appears for about 5 seconds and then disappears. Python25.dll is normally installed in the C:\Windows\System32 folder, not C:\Python25, so whether or not c:\Python25 is in your PATH is irrelevant to whether it will be found (in C:\Windows\System32). I have no Python of any kind in System32. I uninstalled 25 months ago. As far as I can tell, there is not a scrap of it left. The facts as far as I can tell are: a) Some application in your startup is trying to link to/load Python25.dll but failing as per the message you posted. Hmm, I made have made a mistake about a 25 dll. When I rebooted last night, I though I recalled 26. I'll reboot again in awhile and verify that. Yikes! No need. It's 26dll. I wrote it down after my first boot. My second was last night. b) You've uninstalled Python 2.5, so a) is not really surprising. c) The application (whatever it is) will *NOT* automatically start using the newer Python27.dll because you've installed Python 2.7. These are considered seperate/distinct versions of Python. Your options to get rid of the message is: a) Reinstall Python 2.5 b) Remove the application that depends on Python 2.5 (that is expecting it to be present.) To add: I'd be careful of 32 bit/64 bit issues -- If the application trying to run is in fact 32 bit then you should probably be installing the 32-bit version of Python, otherwise it probably still won't find Python25.dll. Forgetting about 25 (32-bit), per above, I installed a 64-bit version of 2.7.2. python-2.7.2.adm64.msi. (32-bit applications won't be able to link to 64-bit dll's, and in any case on 64-bit versions of Windows things get a bit obscure -- C:\Windows\System32 actually contain 64-bit native dll's while 32-bit compatility dll's reside in c:\Windows\SysWOW64 but is presented as c:\Windows\System32 to 32-bit processes by the OS... ) If you don't know whether the application is 32-bit or 64-bit you'll just have to find out by trial and error. Install the one and if this doesn't resolve the problem then remove it again and install the other. Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
On 12/21/2011 9:57 AM, bod...@googlemail.com wrote: I think your missing the point. Ignore the fact that your PATH doesn't contain the correct paths to python. As I just wrote to Prins. I think I made a copy error on the dll. I'm looking at the sheet I wrote the msg on and it shows 26.dll There is no 2.5 on my system. I removed it months ago. True about the PATH, but having Python25 in it was wrong. It's now 27. Why 25 got put in there I do not know. The problem is that on startup, a program (unknown) is looking for the dll file for python2.5 - it is looking for this in the system32 directory. To be rid of the startup errors, you need to replace the dll that was removed by the uninstallation of python2.5 - to do this, reinstall python2.5 See my post to Prins above. Bodsda Sent from my BlackBerry® wireless device -Original Message- From: Wayne Watsonsierra_mtnv...@sbcglobal.net Sender: tutor-bounces+bodsda=googlemail@python.org Date: Wed, 21 Dec 2011 07:15:31 To: Steven D'Apranost...@pearwood.info; tutor@python.orgtutor@python.org Subject: Re: [Tutor] A few Python Mysteries Python is long gone from my system. I only have Python 27. Somewhere a long the line, the uninstall of Python5 probably did not remove the Python5 from the PATH. I have no explanation as to why Python7 was not in the PATH. I have no idea why some remnant of why Python6 is hanging around. I uninstalled it long ago too. On 12/21/2011 2:43 AM, Steven D'Aprano wrote: Wayne Watson wrote: I changed Python25 to Python27, and rebooted. I got the same two dll msgs again. I suggest you find out what applications are trying to run using Python 2.5. This is a Windows problem -- you need to get the list of programs that run at start up and inspect them for something that uses Python. Since I don't use Windows, I can't be more specific. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
Hi, On 12/21/2011 10:18 AM, Walter Prins wrote: Hi Wayne, On 21 December 2011 15:15, Wayne Watsonsierra_mtnv...@sbcglobal.net wrote: Python is long gone from my system. I presume you mean Python **2.5** is long gone from your system (not Python in general), but in any case, this much has been well understood since several emails ago. All but 2.7.2. I only have Python 27. OK, that's also been clear since several emails ago and is not an issue (except that I have the impression that's not working properly either?) Somewhere along the line, the uninstall of Python5 probably did not remove the Python5 from the PATH. I have no explanation as to why Python7 was not in the PATH. To clarify: Python on Windows does **not** put itself on the System PATH when installed. Consequently the reason Python 2.7 is not on the PATH is in fact because no-one put it there (yet), since as I say, So, PythonNN, where NN is the version, should never appear in PATH? Python itself would not have done it. This also explains why C:\Python25 was not removed from the PATH when you uninstalled Python 2.5 -- Since Python's installation never put it there, it obviously wasn't going to remove it when it was uninstalled. Instead, the implication is that something or somebody else put it there -- most It's conceivable when I raised some of the questions a month of so ago, someone suggested putting PythonNN on the path. I recall the PATH idea surfaced back then. likely the application that *did* put it there is the **same** application that is now complaining about the fact that it can't find the Python 2.5 DLL when you boot up... See my mis-copy 26.dll in my other post to you. I have no idea why some remnant of why Python6 is hanging around. I uninstalled it long ago too. I presume by Python6 you mean Python 2.6. Why do you think a remnant of this is hanging around? True. 2.6, and not 6. See previous comments about 26.dll. I think I'm going to pass on the 2.5 comments below in light of the 26.dll typo. Anyway, re the bootup messages, I've already suggested what your options are, but in short: a) Find and remove the application that's trying to use Python 2.5 b) Install Python 2.5 again, and hope that's enough to get the app that wants to use it running again. Re your other Python problems, I'd suggest doing the following: 1) Go into your Control Panel-Programs and Features, and remove all copies of Python (if any.) I'm leaving 2.7.2 there for now. 2) Go into your C:\ Drive, and delete any existing Python folders that may still exist: C:\Python25 C:\Python26 C:\Python25 and 26 are long gone. I'm holding onto 27. 3) Redownload your Python installer (MSI file) of the version of your choice (2.7?) from the Python dowload site and re-install that with default options. Let's hold off on this in light of the 26.dll discover. It may have some bearing on the current state of 27. 4) IDLE should then be present in your Start-All Programs menu under Python 2.7, and should be easily locatable also with the Start menu quick search feature. IDLE shows as normal when I right-click on py files. It just doesn't bring up IDLE. Note, at this point (after the initial installation), Python via the command prompt won't be runnable from anywhere, since C:\Python27 will not have been put on the system PATH yet. A previous post in this thread explains how to add it (and you should be familiar enough with the system PATH by now to do this yourself anyway ;) ) When the PythonNN point I made is answered, then I address the PATH again. Please try these suggestions and post back with specificity if you have further problems. HTH, Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries [Reset]
If you read on past a few paragraphs, there is some reason for hope that 2.7.2 is close to running. But first, the dll story. As it turns out in the other part of this thread, the Python25.dll was a typo on my part. It's really Python26.dll. Upon re-booting to make sure of that I read the message fully, and discovered that it read: C:\Program Files9x86)\Uniblue\DriverScanner\Python26.dll not installed. What is Uniblue you ask? I installed a new version of the video program Winamp back in early Nov, and it had some selections. One of which was to include Uniblue Driver Checker. I thought I'd give it a try. After the install completed, I thought I'd give it a try. It goes through all your drivers to find which ones are out of date. Surprise. You can buy the latest ones through them. I uninstalled Uniblue, but as it turns out, it was an incomplete uninstall. I just spent the last 30-45 minutes trying to get it uninstalled. Finally, I sent an e-mail on how to do it. I have no idea how it got entangled with Python 2.6. So for the time being it's out of the picture. As a question asked by others, is Python27 under ...\System32. It is under C:\Python27. Further, it is the 64-bit version associated with Python. In reading some of the other posts, I was unsure of whether Python27 is put on the PATH or not by the install. The question remains unanswered. I just left it there, as I re-installed 2.7.2 minutes ago. Here's where matters stand. The fact that when I right click on a py file, it begins with Open and then Edit with IDLE is very encouraging. The downside is that IDLE does not come up. However, the Start menu's Python27 entry shows Edit with IDLE, Manuals, ..., and Python Console. The console works. The fact that IDLE actually appears in both places is again encouraging. Under ...\Python27\Lib\idlelib, I can find idle.py, idle.pyw and IdleHistory.py. Clicking on idle.pyw does nothing. A few months ago when I broached this install and IDLE problem, someone mentioned idle.bat. It is in the same idlelib. Is there something that needs to be done here, to get IDLE active? Is this where having Python27 in the path causes a problem with IDLE? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
I changed Python25 to Python27, and rebooted. I got the same two dll msgs again. On 12/19/2011 7:33 PM, Wayne Watson wrote: It became apparent during the other part of this thread that I had not uninstalled Python 2.7, as I thought I had. As pointed out in the PATH discussion (James R.), the last item in the system variable PATH was Python25. I would think then changing it to Python27 might Python rolling again. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] A few Python Mysteries
Win 7, 64-bit I had Py 2.5 installed on my PC earlier this year, and it began failing around June. I finally uninstalled it, and tried 2.6. Still had problems that centered around getting to IDLE. Uninstalled 2.6, and went to 2.7. Same problem. I completely uninstalled 2.7. I do have several folders of py programs. No Python. After that episode, I began to notice the following messages when I signed on to my PC after a boot. I do not bring my PC down very often. Specified module could not be found: Loadlib python.dll failed, and another of the same for Python25.dll failed (maybe not found). I did a search for both, but neither were found. I ignored this inconvenience for a few weeks, and had developed a need to copy a particular python program on Win 7 to another computer. Call it abc.py. I copied it to a thumb drive, and plugged the drive into the other PC, which has Python on it. abc.py was missing from the drive. I tried this about three times, and even went to yet another PC. No abc.py. Finally, I pulled xyz.py from an XP PC on to the drive. When I put it on yet another PC, xyz.py was there, and I copied it on to the PC. Very strange. Note again, I did not have Python installed on the Win 7 PC. I have no idea if any of this is relevant to the attempt to install Py on my Win 7 PC, but it and the sign-on msgs may indicate something is twisted in the registry. Comments? It would be nice to get rid of the two msgs upon sign-on. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
On 12/19/2011 8:50 AM, James Reynolds wrote: On Mon, Dec 19, 2011 at 11:35 AM, Wayne Watson sierra_mtnv...@sbcglobal.net wrote: Win 7, 64-bit I had Py 2.5 installed on my PC earlier this year, and it began failing around June. I finally ... CE 1955 October 20 07:53:32.6 UT -- "The Date" The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Did you change the PATH to the right directory? It may still be pointing to the old directory, or you may have never set it to begin with. Someone suggested this several months when I was having an install problem. === That being said, it sounds an awful lot like the python.exe isn't in your path. To get it there you can open windows explorer (WIN+E) right click on computer properties then click advanced system settings. In the window that pops up, click the "environment variables" button. In the "system variables" portion, find the path variable and click the "Edit..." button. Assuming that your new installation was placed in C:\Python25\ you will want to add ";C:\Python25\" (the semicolon is important!) to the end of your path. === Is that what you are suggesting? I brought up WE and clicked on properties, and got a six tab dialog. Pushed Advanced. Tabs are: Sharing, Security, Prev versions, general, tools, h/w, quota. I don't see anything about about a PATH, sys or env vars. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39 15' 7" N, 121 2' 32" W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- "The Date" The mystery unfolds. Web Page: www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
1. Go to start 2. Right click on Computer 3. Select Properties. This will bring up the System menu. 4. Select Advanced system Settings on the left hand side. 5. In this new window, select Environment variables... at the bottom 6. In the bottom window area, scroll down until you find PATH 7. Select Edit (do NOT delete anything contained in this or will screw some stuff up) 8. scroll to the very end and put a ; as a deliminator if there isn't one on the end already. Then put the direct path to you Python install you care about. (it should be something like this:(;C:\Python27) I see at the end: Program Files\jEdit;C:\Python25\ There is no Python on my PC. Python 2.5 is what I started with, so I guess I should make this: Program Files\jEdit - this is mine in fact. 9. Hit OK. Then accept your way out. You will have to reboot. 10. To test, open a cmd prompt and and type simply python. if you get Python 2.7.2 (some more stuff) then python is now on your path. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
On 12/19/2011 3:19 PM, Steven D'Aprano wrote: Wayne Watson wrote: Win 7, 64-bit I had Py 2.5 installed on my PC earlier this year, and it began failing around June. I finally uninstalled it, and tried 2.6. Still had problems that centered around getting to IDLE. Uninstalled 2.6, and went to 2.7. Same problem. I completely uninstalled 2.7. I do have several folders of py programs. No Python. Programs should not just begin failing unless somebody (you?) or something (a virus, another program?) mess with them. Especially not something as simple and stable as Python. Who installed Python 2.5 in the first place? If it was provided with your computer, then it was I did. It worked for months. provided for a reason. Python is not a standard part Windows, but a number of PC manufacturers provide Python 2.5 to run their tools, and by removing it, you have broken whatever it is that the manufacturer tools are supposed to be doing. Installing Python 2.6 or 2.7 will probably not work as a replacement. If you installed Python 2.5 yourself, then it doesn't matter. However, my guess is that Python 2.5 was installed by the manufacturer, and my evidence for this is the error messages that you now see at boot up: After that episode, I began to notice the following messages when I signed on to my PC after a boot. I do not bring my PC down very often. Specified module could not be found: Loadlib python.dll failed, and another of the same for Python25.dll failed (maybe not found). I did a search for both, but neither were found. Of course they're not found. You uninstalled them. I would expect so, but why did it complain specifically about them and not others? See PATH comment below. My first advice: re-install Python 2.5. If you have a recovery disk supplied by the manufacturer, try using that. Make sure you install a 64-bit version of Python, not 32-bit. I really no longer have a need for 2.5, so I thought I might as well go for something newer, which is basically what I'm doing, since 2.5 wasn't working. Then do the same with Python 2.7. Make sure it is the 64-bit version. Then check that you still have BOTH Python 2.5 and 2.7 installed: look in the start menu, and you should see two entries for Python. Whoops. Python 2.7.2 is on the menu and was installed 12/18. I thought I uninstalled it last night. It is the 64-bit version. It's beginning to look like the PATH is the problem, since I found Python25 at the end of the PATH variable, as noted to James above. I ignored this inconvenience for a few weeks, and had developed a need to copy a particular python program on Win 7 to another computer. Call it abc.py. I copied it to a thumb drive, and plugged the drive into the other PC, which has Python on it. abc.py was missing from the drive. I tried this about three times, and even went to yet another PC. No abc.py. This has *nothing* to do with Python. To Windows, abc.py is just another file, like abc.txt or abc.jpg or abc.doc. If copying files to a thumb drive is failing (other than by human error, or faulty thumb drive), then you have deeper problems with your Windows installation than just missing Python. But I suspect either human error or a faulty thumb drive. Since I don't use Windows 7, and did not see how you tried to copy the file to the thumb drive, I can't be sure, but if something as fundamental as copying files was failing, then I would expect your Windows machine to be crashing constantly. So more likely the thumb drive is failing, or human error. Can you copy *other* files from the Windows 7 machine onto the thumb drive, and then from there to the second computer? No problem at all copying any other files to the thumb drive. After I get out of this quandary with PATH, and get 2.7.2 working, I'll try to recreate the problem. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
The PATH variable for me (user) has c:\Users\Wayne\g95\bin On 12/19/2011 12:25 PM, Prasad, Ramit wrote: James wrote: In windows 7, 1. Go to start 2. Right click on Computer 3. Select Properties. This will bring up the System menu. 4. Select Advanced system Settings on the left hand side. 5. In this new window, select Environment variables... at the bottom 6. In the bottom window area, scroll down until you find PATH 7. Select Edit (do NOT delete anything contained in this or will screw some stuff up) 8. scroll to the very end and put a ; as a deliminator if there isn't one on the end already. Then put the direct path to you Python install you care about. (it should be something like this:(;C:\Python27) - this is mine in fact. 9. Hit OK. Then accept your way out. You will have to reboot. 10. To test, open a cmd prompt and and type simply python. if you get Python 2.7.2 (some more stuff) then python is now on your path. = Modify User Variables and not System variables. You will need to restart any open command prompt but not the full machine. PATH=%PATH%;c:\python27 That should pick up the system variables and then append python's location to it. http://geekswithblogs.net/renso/archive/2009/10/21/how-to-set-the-windows-path-in-windows-7.aspx If that does not work; then feel free to follow James's advice and then restart. Ramit Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology 712 Main Street | Houston, TX 77002 work phone: 713 - 216 - 5423 -- This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A few Python Mysteries
It became apparent during the other part of this thread that I had not uninstalled Python 2.7, as I thought I had. As pointed out in the PATH discussion (James R.), the last item in the system variable PATH was Python25. I would think then changing it to Python27 might Python rolling again. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet CE 1955 October 20 07:53:32.6 UT -- The Date The mystery unfolds. Web Page:www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 'str' object has no attribute 'description'
On Sun, Dec 18, 2011 at 4:06 PM, Russell Shackleton rsh...@xtra.co.nzwrote: I am learning Python classes by writing an adventure game. I have extracted just the relevant code. The player can look, go, drop, take, inventory but not examine. Python produces the error message in the Player class, examine function, in the first print statement. It's best to give the full traceback, because it provides an awful lot of information. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] sqlite3: turning on foreign key support thru python
On Fri, Dec 16, 2011 at 1:43 PM, Modulok modu...@gmail.com wrote:
How do I tell if it succeeded (short of trying an operation that should
be
blocked by foreign keys)? How do I use that cursor object returned by
the
pragma query to tell if its a '1' (on) or a '0' (off) and verify the
state?
The cursor object contains the result set. It's a python generator object.
(Or
at least a generator interface.) You have to iterate over it in order to
see
the resulting rows which are stored as a tuple. Not all operations return a
result row. (For example, conn.execute('pragma foreign_keys=ON' will
return a
cursor object, but it won't generate any result rows, as there were
none returned by the database.)
To see the result of your second command, do something like this::
rows = conn.execute('pragma foreign_keys')
for r in rows:
print r
If you're mucking about in the interactive prompt, and you just want to see
the results quickly you can just turn it into a tuple or a list (list would
be less typing):
print(list(rows))
or just
list(rows)
HTH,
Wayne
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Re: [Tutor] reset password program
On Fri, Dec 16, 2011 at 7:17 PM, Robert Sjoblom robert.sjob...@gmail.comwrote: Some improvements to think about, in order of least secure (easiest) to most secure (hardest). (1) my secret password.txt is a crappy name. Is there a better name? I'm going to go with EULA.txt; the reasons should be obvious. +1, because I laughed. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 'str' object has no attribute 'description'
On Sun, Dec 18, 2011 at 4:49 PM, Russell Shackleton rsh...@xtra.co.nzwrote: I am learning Python classes by writing an adventure game. I have extracted just the relevant code. The player can look, go, drop, take, inventory but not examine. Python produces the error message in the Player class, examine function, in the first print statement. I have added the traceback following a suggestion from Wayne Werner. That's much more useful. As a slight aside, it probably would have been better to just reply-all to the original thread with the traceback. Traceback (most recent call last): File adv03.py, line 205, in module main() File adv03.py, line 202, in main game.play(adventurer) File adv03.py, line 147, in play character.examine(cmdlist[1]) File adv03.py, line 86, in examine print Item Description: + item.description + .\n AttributeError: 'str' object has no attribute 'description' [Note: actual line numbers appended in comments in this listing] This is *much* more helpful - I don't even need to see your code to tell you what went wrong. I don't know if you've worked with other programming languages with nearly useless stack traces, but in Python you'll find that they're (usually) very high quality. In this case it tells you a few things. First, it tells you where it happened with this line: File adv03.py, line 86, in examine It happened in the file adv03.py, on line 86, in a function (or method) called examine. The next two lines tell you what blew up, and why it did: print Item Description: + item.description + .\n AttributeError: 'str' object has no attribute 'description' 'str' object has no attribute 'description'. Well if you look on the line before that the only description attribute you try to look up is item.description. So if 'str' doesn't have that attribute then item must be a string. With that in mind, let's take a look at that function: def examine(self, item): Prints description of item. if item in self.items: # Error: 'str' object has no attribute 'description' print Item Description: + item.description + .\n # line 86 else: print You are not holding the + item + to examine!\n This looks pretty straightforward. You pass something in as item, and check to see if it's contained in your list of items. If it is, then you print out the description, otherwise you print out whatever you passed in. And so if we rewind back to where you call the function: character.examine(cmdlist[1]) # line 147 What is cmdlist? A list of strings. What is contained in cmdlist[1]? If you still have issues fixing this, please let us know. HTH, Wayne How do I fix this code, please? class Player(object): The player in the game. def __init__(self, name, currentRoom=None): self.name = name self.currentRoom = currentRoom self.items = [] # items taken by Player def look(self): Prints the room description, exits and items in the current room. print self.currentRoom def go(self, direction): Go to another room through an exit. def drop(self, item): Drop an item you are carrying in the current room. def take(self, item): Take (pick up) an item from the current room. if item == self.currentRoom.item: self.items.append(item) print self.currentRoom.item + added to player's inventory.\n # remove item from currentRoom self.currentRoom.item = '' else: print There is no + item + here to take!\n def inventory(self): Prints list of items the player is carrying. def examine(self, item): Prints description of item. if item in self.items: # Error: 'str' object has no attribute 'description' print Item Description: + item.description + .\n # line 86 else: print You are not holding the + item + to examine!\n class Item(object): A useful item in the game. def __init__(self, name, description, location): self.name = name self.description = description self.location = location def __str__(self): Description of item. return self.description class Game(object): The adventure game. def __init__(self, name, player): self.name = name self.player = player print Welcome to + self.name + \n print player.currentRoom def play(self, character): Command loop for game. while True: # loop forever commands = raw_input(- ).lower() if not commands: print Huh? else: try: cmdlist = commands.split() # separate commands action = cmdlist[0] if action == quit: print See you later! break
Re: [Tutor] where I am going wrong?
On Wed, Dec 14, 2011 at 8:13 AM, surya k sur...@live.com wrote: This is a project Euler puzzle. http://projecteuler.net/problem=30 I applied brute force way and here is my code k=0for p in range(1,10):for q in range(0,10):for r in range(0,10):for s in range(0,10):for t in range(0,10): n = (p*1)+ (q*1000) + (r*100) + (s*10) + (t*1) if n == \ p**5 + q**5 + r**5 + s**5 + t**5:print n k+=nprint k My answer: 240559 But its showing the answer as wrong!!. I used the same method on the example puzzle and it worked. Your email client broke the formatting - you should probably use plain-text or a pastebin. -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] return, why do I need it?
On Dec 11, 2011 8:41 AM, Pete Oapos;Connell pedrooconn...@gmail.com wrote: Hi I have been writing python code for a while now and I never return anything within any of my functions, I just (eg.) print stuff or make directories or update a log or what have you. When I look at other people's code they are always returning in their functions and I was wondering if someone could give me an example of when I would absolutely have to return something. The thing I don't like about returning is that when I unindent a function and try to run the code to inspect parts of it for debugging I always have to alter the code so as not to get the return not inside a function error, so I will change the word return to print and in many cases that's the way I leave it. Anyone have any thoughts on this? No one has mentioned it so far, but the interactive interpreter is what you should use for debugging short code snippets. I always program with two windows open - one with my editor and one with the interpreter. This lets me try out short bits of code without running my whole program. Hth, Wayne Thanks Pete ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Windows Vista Installation Question
On Fri, Dec 9, 2011 at 12:41 PM, Homme, James james.ho...@highmark.comwrote: Hi, Can Python easily be installed on a Windows Vista computer without needing administrative rights to that machine? If you use portable python: http://www.portablepython.com/ that might work for you. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to use int and split() simultaneously
On Thu, Dec 8, 2011 at 7:43 AM, Dario Lopez-Kästen cl2dl...@gmail.comwrote: snip In that case a for loop with a try-except would better: strNum = raw_input(enter numbers, separated by space: ).split() num_list = [] for token in strNum: try: num_list.append(int(token)) except ValueError: # Do nothing, fetch the next token continue print repr(num_list) snip Strictly speaking the continue in the except clause is not necessary in this simple example. Though you do have to have *something* or you'll get a syntax error because you can't have an empty block. The keyword `pass` works well in cases like this. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Saved the Day
On Sun, Dec 4, 2011 at 2:51 AM, wesley chun wes...@gmail.com wrote: Does anyone else have similar stories? (I think I may be biased as I use Python for everything, trouble or otherwise, so I can't tell the difference anymore!) I work in a .NET shop, and the last project I worked on required us to re-implement a report system that was doing a variety of complicated things (due to the nature of the older tech used). This required us to run and re-run our version to compare against the old, many many times. My teammate started doing the comparisons by hand using a merge tool... after watching that process for about 5 minutes, I went ahead and wrote a quick Python script (30 lines) that would compare the two reports. I ended out extending the script to a full blown text-program with some nice menus and things, and all told probably spent less than an hour or two writing scripts that saved... probably at least 10 man hours of comparisons, probably much more than that when you factor in the exhaustion from doing such a menial task. The tools that I found extremely useful: 1) Modules - I used re and csv fairly heavily. One piece of the report was textual and the re module allowed me to easily parse out the important information from each report. The other one was a spreadsheet, so csv readers were quite nice 2) List comprehensions/generator expressions - mutating the data from text to something that I could really use took two or three passes. Being able to express this in two or three lines was invaluable 3) Syntax (including dynamic binding) - the terse syntax allowed me to express what I wanted to express, with no extra stuff (e.g. End With) Personally I wish I was in your shoes (using it for everything), but I'm a huge Pythonista so that should hardly be a surprise ;) (and definitely wouldn't be a surprise for any of my former classmates. I was quite the evangelist... and still am) -Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Prime Factorization Tool
On Thu, Dec 1, 2011 at 7:15 AM, Robert Sjoblom robert.sjob...@gmail.comwrote: So I've recently started poking at the Project Euler site, because I feel that I need to practice writing code. For those of you interested in solving the problems on your own I advice you to not read this, as it will spoil the solution. Problem 3 is this: The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? I came up with this pseudocode: #pseudocode: #divide by x until non-prime is found: #if not remainder: #check if it's prime or not: #if not prime: exit loop #if not prime: store in variable #increment x by 1 Here are the functions I came up with: def isprime(n): if n == 1: return False for x in range(2, n): if n % x == 0: return False else: return True def factorization(n): factor = 0 x = 2 while True: if n % x == 0: if isprime(x): factor = x else: return factor x += 1 This, however, feels horribly inefficient. Is there a better way to do it? I think most of my problems stem from my weak mathematical skills, to be honest. This wasn't too bad, but even for problems 1 and 2 I've relied on brute forcing the answer instead of looking for a mathematical solution. Well, there are really only a couple of optimizations that you could make. That's the nice (bad?) thing about primes - you really only *can* brute force a solution. That's why nice things like encryption exist. The less obvious optimization is in reference to primes - you don't actually have to check all the way up to N. Or even N/2. You only have to check numbers up to the square root of N. This explanation may not be mathematically sound, but basically the reason this works is the definition of prime: N is divisible only by N and 1. If you divide a number by 2 then then the result will be the largest factor (e.g. 100/2 = 50). But as you start increasing the divisor then obviously the result has to decrease. The point at which these numbers are equivalent? The square root, of course. That will easily decrease the running time of your program because now instead of dividing N numbers you're dividing sqrt(N) numbers. The other optimization that you can do is in the factorization loop - you're checking all factors from 2 to N. The easiest fix here is the fact that you *know* that no even number can be a prime factor for the simple reason that it's divisible by 2. So start your loop at 3 and increment by 2 and you've just cut out half the numbers. But wait, there's more! What is the largest possible factor of a number? I'll let you think about it for a moment... Got it? Hey, no peeking! Well, I guess you can peek. N/2 is the largest possible factor. Any number larger than N/2 is somewhere between N/2 and N/1, and since there's no whole number between 2 and 1 you know that the largest number you need to check for a factor is N/2, or in the case of 100/2 = 50. So for 100, instead of checking if 100 numbers are prime, now you're only checking: 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 49 *much* fewer numbers. And for each N in that list you're only checking up to the sqrt(N). Now you've vastly improved your running time. Now, I'm not sure what the time complexity of these two operations is, but go ahead and put this line in your isprime: if n == 11: print(Checked 11... again) Can you think of a way to compute the primes you need to check only once? HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] tkinter message button questions
On Wed, Nov 30, 2011 at 8:32 AM, Cranky Frankie cranky.fran...@gmail.comwrote: Peter Otten __pete...@web.de wrote: snipPeter thanks again. The msg_widget is still resizing vertically depending on the lenght of the quote, but at least now the horizontal sizing is staying the same. Ideally the msg_widget would be the *same size*, no matter what the quote length is, but since this program is really just a learning exercise and to show database adminstrators a simple Python GUI application I can live with it. The whole purpose of the Message widget is that it *does* resize. If you wanted something to be a static size, I think a Label would fit the bill - though I haven't played around enough with that in recent time. The syntax you used, like root.geometry(400x100), I have not seen before, and I've done a lot of searching. Again, much of the tkinter stuff I see seems to be based on Python 2.6. If there is a definitive book or reference on using tkinter in Python 3.x I'd really like to know about it. That's the great thing about Python - most of the syntax is identical, and there should be only minor differences between Python 2.x and 3.x - especially where Tkinter is concerned. I would go ahead and look at 2.x tutorials/articles for Tkinter and just be aware that you'll encounter some issues (probably mostly dealing with Unicode strings, and occasionally something numeric - based on my experience). With that preparation then you should be able to easily search for answers to the problems you encounter. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] plotting in python
On Wed, Nov 30, 2011 at 3:08 PM, stm atoc stm.at...@googlemail.com wrote: Hi there, I have a question regarding plotting with Python. snip ValueError: x and y must have same first dimension It looks like something is wrong with the data that you're trying to plot. Specifically, the data that you're trying to plot has the wrong dimensions (like it says). An example: # 2d space: x = [(1, 1), (2, 2), (3,3)] y = [(1,1,1), (2,2,2), (3,3,3)] x is a series of points in 2 dimensions, and y is a series in 3. If your data really is supposed to look like that then you'll need to pad or trim the data so you've got the correct dimensions. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] is there a better way to organise this code
On Wed, Nov 30, 2011 at 3:34 PM, Norman Khine nor...@khine.net wrote: hello, is there a better way to organise this code or optimise it. http://pastie.org/2944797 After glancing at it the only change that I would recommend (possibly) making is lines 58 and 39 - you can wrap the dictionaries (line line 7) and that will bring all your lines 80 characters. Other than that it looks perfectly readable. You could add some docstrings for completeness. As far as anything else - is this code too slow? If not, why bother trying to optimise it? Obviously if you were doing something horribly inefficient like a bubble sort (especially considering Python has a built-in sort), then you would want to get rid of that, but I didn't really notice anything. Though now that I took a few more seconds, it does look like you're not using rows, aside from looping over it. If you only care about the values and not the collection as a whole you could (and should) change the list comprehension to a generator expression: [x for x in (1,2,3)] [1, 2, 3] (x for x in (1,2,3)) generator object genexpr at 0x01BFB6C0 If you're not familiar with a generators, I highly recommend this set of slides: http://www.dabeaz.com/generators/Generators.pdf HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem with msg widget button
On Tue, Nov 29, 2011 at 9:54 AM, Cranky Frankie cranky.fran...@gmail.comwrote:
Peter Otten __pete...@web.de wrote:
snip
Isn't msg_widget an object, like everything else in Python. If so, why is
it not
def display_quote():
msg_widget.text = choose_quote()
That is one of the things I tried. I don't understand why the [test]
pair works above.
Just because msg_widget is an object doesn't automatically give it a .text
attribute. Just like the following dictionary (which is an object):
knights = {'Aurthur': 'King of the Britons', 'Robin':'The Brave'}
knights['Robin']
'The Brave'
knights['Robin'] = 'The Coward'
knights.Robin
Traceback (most recent call last):
File stdin, line 1, in module
AttributeError: 'dict' object has no attribute 'Robin'
They simply made a design choice to allow access to the data via index (in
this case text is the index), rather than by object attribute.
HTH,
Wayne
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Re: [Tutor] Making a function run every second.
On Tue, Nov 29, 2011 at 10:09 AM, Dave Angel d...@davea.name wrote: sniptkinter provides a couple of specific timer events, and I now see your reply to a message that said to use the after() method, which is a one-shot. I believe there's another one that sets a periodic timer so you don't have to do an after() call each time it fires. Not in Tkinter - you have to do what Peter Otten suggested: For a script that uses tkinter there's the after() method. Example: root = Tk() def hi(): print(ho) def hi_reschedule(): hi() # make tkinter call it again after 1000 milliseconds root.after(1000, hi_reschedule) hi_reschedule() # call it manually the first time HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] list, tuple or dictionary
On Tue, Nov 29, 2011 at 2:31 PM, ADRIAN KELLY kellyadr...@hotmail.comwrote:
i am trying to create a program that will allow users to enter items and
their prices; should i be looking at a list, tuple or what?
The entering part isn't as important as how you want to display the data.
For instance, here's a program that allows the user to input an unlimited
amount of data (using Python 3.x):
while input(Enter q to quit, or an item: ).lower() not in ('q', 'quit',
'goodbye'):
input(Enter the price: )
Of course it doesn't store the data, so it's pretty useless. But it does
allow the user to input whatever they want.
If you wanted to simply create a collection of items you could do it as a
list with alternating values:
inventory = ['Crunchy Frog', 4.13, 'Anthrax Ripple', 12.999,
'Spring Surprise', 0.00]
for x in range(0, len(inventory)-1, 2):
print(inventory[x], inventory[x+1])
Or as a list of tuples:
inventory = [('Norwegian Blue', 500.00), ('Slug', 500.00), ('Cage',
50.00)]
for item in inventory:
print(item[0], item[1])
Or a dictionary:
inventory = {'Spam':5.00, 'Spam on eggs':10.00, 'Spam on Spam':7.50}
for item, price in inventory.items():
print(item, price)
Or if you wanted to get ridiculous, you could go with a list of classes:
class Item:
def __init__(self, desc='', price=0.00):
self.desc = desc
self.price = price
def __repr__(self):
return str(self)
def __str__(self):
return {0} - {1}.format(self.desc, self.price)
inventory = [Item('Lumberjack', 5.5), Item('Tree', 50), Item('Flapjack',
0.5)]
for item in inventory:
print(item)
It just depends on how complex you want to get!
HTH,
Wayne
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Re: [Tutor] list, tuple or dictionary
On Tue, Nov 29, 2011 at 3:04 PM, ADRIAN KELLY kellyadr...@hotmail.comwrote:
thanks guy, i was thinking of using a dictionary:-
Stock_list = {White Bread: 1.24,
Biscuits: 1.77,
Banana : 0.23,
Tea Bags : 2.37,
Eggs : 1.23,
Beans : 0.57}
how would i go about *adding, *for example tea and eggs to get a subtotal?
Why, you would add tea and eggs, of course!
print(Subtotal: , Stock_list[Tea Bags] + Stock_list[Eggs])
HTH,
Wayne
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Re: [Tutor] pass tuples to user defined function(beginner)
On Tue, Nov 29, 2011 at 3:40 PM, Mayo Adams mayoad...@gmail.com wrote:
I cant immediately see how anything in a script is
anything other than a representation of some kind, hence the
distinction between representamen and object does no work for me.
That's exactly it - when you have something like this in a file named, say
data.txt:
(This, 'is', 'a', 'silly', 'tuple')
Then that's all it is - just text data. I happens to *look* like a tuple,
but it's not. If you rename that file to data.py... well, it's still text
data. If you add an assignment operation to the line:
data = (This, 'is', 'a', 'silly', 'tuple')
Then you could actually import it with `from data import data`. Once the
data is actually evaluated, then it's live - it really is a tuple, and it
can be used in tuple-ish ways.
I think the main reason to make a distinction like that is that if you
encounter a .py file with data like this:
__import__('os').system('echo i got you now rm-rf')
You know it's probably going to do some bad things to your system if you
run it. If you open that in a text editor, on the other hand, it's unlikely
to do anything painful.
I think there's also some use in making the distinction between data and
code. Python provides you with /ridiculously/ easy ways to read in data. So
if you have a bunch of strings that you want in a tuple you should do
something like:
data = tuple(f.open('data.txt').readlines())
Which has the added advantage of *just* reading in strings. If you want to
convert that data into other types (integer, float, etc.) then you can
easily do it explicitly, and explicit is better than implicit.
In reality of course, all the data is just 1's and 0's floating out there,
but I think it's helpful to develop these abstractions.
HTH,
Wayne
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Re: [Tutor] Writing Game in python
On Sun, Nov 27, 2011 at 7:52 AM, surya k sur...@live.com wrote: Hi, Actually, I want to develop a multiplayer Bingo game. So, I would like to develop it in python C. As I am not familiar with game development, could you please tell me what libraries I should use for development?... etc You could easily develop the game entirely in Python. As for libraries... well it depends on what you're trying to do. If you want a GUI you'll want to look at one of the frameworks like Tkinter, PyGTK+, wxPython, or QtPython. Alternatively you could look at the PyGame library which is geared towards game development. If you want to do internet communication, you'll want to investigate the socket module, and possibly the threading module. How familiar are you with Python? Have you written any programs before? What would really help is if you gave us some psuedocode of your algorithm or the steps you think each piece should need to accomplish. We like to see that you've at least tried to do something. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python 3 dictionary questions
On Wed, Nov 23, 2011 at 7:04 AM, Cranky Frankie cranky.fran...@gmail.comwrote:
In playing around with Pyton 3 dictionaries I've come up with 2 questions
1) How are duplicate keys handled? For example:
Qb_Dict = {Montana: [Joe, Montana, 415-123-4567,
joe.mont...@gmail.com,Candlestick Park],
Tarkington: [Fran, 651-321-7657, frank.tarking...@gmail.com,
Metropolitan Stadidum],
Namath: [Joe, 212-222-, joe.nam...@gmail.com, Shea Stadium],
Elway: [John, 303-9876-333, john.el...@gmai.com, Mile High
Stadium],
Elway: [Ed, 303-9876-333, john.el...@gmai.com, Mile High
Stadium],
Manning: [Archie,504-888-1234, archie.mann...@gmail.com,
Louisiana Superdome],
Staubach: [Roger,214-765-8989, roger.staub...@gmail.com,
Cowboy Stadium]}
print(Qb_Dict[Elway],\n)# print a dictionary
entry
In the above the wrong Elway entry, the second one, where the first
name is Ed, is getting printed. I just added that second Elway row to
see how it would handle duplicates and the results are interesting, to
say the least.
2) Is there a way to print out the actual value of the key, like
Montana would be 0, Tarkington would be 1, etc?
I'm not sure about #1, but I can tell you about #2.
Dictionaries are not ordered, so you have absolutely no guarantee which
order they'll appear in when you print them out, or if you iterate over the
dictionary. If you want to maintain some type of order you have a few
options. First, store the keys in a list, which does maintain order:
keys = ['Elway', 'Montana', ... ]
Then you would do something like:
Qb_Dict[keys[0]]
(As a slight aside, I'll direct you to PEP 8 which is the Python style
guide which contains things like naming conventions. If you want your code
to look Pythonic, you should take a look there.)
If you just want them to be sorted, you can run sorted on the keys()
collection from the dictionary:
for key in sorted(Qb_Dict.keys()):
print(Qb_Dict[key])
In Python 3 this will only work if your collection contains comparable
types - if you have {1:'Hello', 'Goodbye':2} then you'll get a TypeError
when it tries to compare 1 and 'Goodbye'
HTH,
Wayne
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Re: [Tutor] sensing EOF in Python 3.1
On Wed, Nov 23, 2011 at 12:03 PM, Cranky Frankie
cranky.fran...@gmail.comwrote:
[...]
The reason why I'm pickling is I'm trying to include information on
Python data structures in the presentaton I'm preparing. [...]
In your context why not just use modules?
# data.py
Qb_dict = {Montana: [Joe, Montana, 415-123-4567,
joe.mont...@gmail.com,Candlestick Park],
Tarkington: [Fran, 651-321-7657, frank.tarking...@gmail.com,
Metropolitan Stadidum],
Namath: [Joe, 212-222-, joe.nam...@gmail.com, Shea Stadium],
Elway: [John, 303-9876-333, john.el...@gmai.com, Mile High
Stadium],
Elway: [Ed, 303-9876-333, john.el...@gmai.com, Mile High
Stadium],
Manning: [Archie,504-888-1234, archie.mann...@gmail.com,
Louisiana Superdome],
Staubach: [Roger,214-765-8989, roger.staub...@gmail.com,
Cowboy Stadium]}
# program.py
from data import Qb_dict
print(Qb_dict)
Then you can put whatever comments or data you want. Just make sure that
you don't name your data.py file the same as something built-in. It's
pretty horrible when you try to 'import random' and it doesn't randint() or
anything else that you're looking for.
HTH,
Wayne
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Re: [Tutor] FW: urgent help!! THANKS EVERYONE!
On Fri, Nov 18, 2011 at 9:26 AM, Prasad, Ramit ramit.pra...@jpmorgan.comwrote:
Forwarding to the list since I wasn't the only person who helped ;)
From: ADRIAN KELLY [mailto:kellyadr...@hotmail.com]
Sent: Thursday, November 17, 2011 6:08 PM
To: Prasad, Ramit
Subject: RE: [Tutor] urgent help!! THANKS EVERYONE!
Thanks for your help i just got it going my way below - but your way looks
easier and better!
thanks for all your help everyone. feel free to comment on my method -
its awkward but it works.. snip
def main():
amount=0
amount = float(raw_input('how much do you want to change:'))
while amount50:
print 'enter an amount over 50'
amount = float(raw_input('how much do you want to change:'))
else:
total=exchange(amount)
print 'Your exchange comes to: ',total
In these sorts of cases I actually prefer the recursive solution. And from
a usability standpoint it's much nicer to warn the user ahead of time:
def amount_over_50():
amount = float(raw_input(How much do you want to change (minimum $50)?
Amount: $))
if amount 50.0:
print 'Please enter an amount greater than $50'
return amount_over_50()
return amount
Then you can just do this:
def main():
print 'Your total comes to', exchange(amount_over_50())
The chances of hitting the maximum recursion depth is pretty slim, unless
your user manages to type in a wrong number about 1000 times ;)
HTH,
Wayne
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Re: [Tutor] Saving read-only or encoded text files?
On Fri, Nov 18, 2011 at 11:17 AM, Max gmail maxskywalk...@gmail.com wrote: Thank you. This will work perfectly. On Nov 18, 2011, at 11:58 AM, Prasad, Ramit wrote: snip Any file will eventually be able to be reverse engineered, but it matters how much effort you care to obfuscate it. The way you can do it will vary based on your OS. For Windows, you can change the file extension to something that is not read by most text editors '.zxy'. It will still be able to be read if they try and open it with a text editor, but double clicking will not work by default. You can also try setting the file attribute directly: http://code.activestate.com/recipes/303343-changing-file-attributes-on-windows/ For *nix/OS X, you can prepend the file with . as those files are hidden by default on most *nix systems I have used. You can also try to use os.chmod(0###, 'filename'). Keep in mind that all of these solutions are probably user reversible since the application will have the permissions of the user account it is run as; in most cases this is the same as the logged in user. snip As an addition, you can also create the file using the zipfile module ( http://docs.python.org/library/zipfile.html). This adds another layer of obfuscation and has the added benefit of making your files smaller. Of course, the savvy user won't have any issue getting past this (Office files are just archive files). On Ubuntu at least, if you just remove the extension then it will attempt to discover what the filetype, and can usually guess archive types. It's security through obscurity, of course, so it all depends on who you're worried about accessing this data. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Clock in tkinter?
On Thu, Nov 17, 2011 at 8:57 AM, Mic o0m...@hotmail.se wrote: snip Okay, to begin with, I hope I am replying correctly now. Better, though there was quite a lot of my email that you could have removed. I wonder, how do I add a background picture to my GUI window? So far, I thought I could make a label that is as large as the entire window, and then add a picture to it. The other widgets are supposed to be placed on top of the picture. But I am lost on how to accomplish this. Can you point me in the right direction to solve this? If you want to do this, I would recommend using the place (as opposed to pack or grid) manager inside of a frame widget. Use that to place your image, and another frame that contains your other widgets - I would use the pack or grid layout inside this other frame, though. HTH, Wayne ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Clock in tkinter?
On Thu, Nov 17, 2011 at 1:17 PM, Mic o0m...@hotmail.se wrote:
I have now worked to stop using the global scope and instead put my
prior global variable into
the constructor in the class. I believe that I have managed to do that now.
Do you believe that this is correctly done?
#Trying putting the_time'' in constructor instead of
#putting it in the global scope to shorten code.
snip
def update_time(self):
self.display_time.config(text=time.strftime('%H:%M:%S'), font='40')
self.after(20, self.update_time)
Since you're using the shorter version of the function you no longer need
self.the_time, so you can go ahead and remove that variable.
I have another question.
It would have been fine (and even preferred) to create a new email here
with a title something like How do I shorten this code?
Say that I have a class and I want to make 100 objects.
Then it could look like this:
snip
class Chairs(object):
snip code
#Create the objects
chair1=Chairs(10,20)
chair2=Chairs(10,20)
chair3=Chairs(10,20)
How do I shorten this? I have thought of using a for sling. I have looked
in my programming
book and on the internet, but I don’t know how to make this shorter. The
arguements (“10”, “20”)
should be the same for every object, which should make it easier than if
they were different each time?
If you ever write a line of code more than once, it's a good sign that you
have what's called a code smell. This example is very smelly code ;)
What you should do instead is have a collection of chairs:
chairs = []
for _ in range(100): # the underscore `_` indicates that you don't care
about the value
chairs.append(Chairs(10,20))
You can do that even shorter with a list comprehension, but I'll leave that
exercise up to you :)
HTH,
Wayne
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