Re: [Tutor] Question about subprocess
On Sat, Jan 11, 2014 at 12:46 AM, Danny Yoo d...@hashcollision.org wrote: There is a warning in the documentation on subprocess that might be relevant to your situation: Warning: Use communicate() rather than .stdin.write, .stdout.read or .stderr.read to avoid deadlocks due to any of the other OS pipe buffers filling up and blocking the child process. Reference: http://docs.python.org/2/library/subprocess.html It's possible that the process is deadlocking due to this situation. Do you run into this issue if you use communicate()? If more than one standard file is piped (not the case for the OP), `communicate` avoids deadlocks by using `poll` or `select` on POSIX. On Windows, it uses the current thread to write to stdin and uses separate threads to read from stdout and stderr. If only one standard file is piped, then there's no deadlock. It's just blocked while waiting for the buffer to fill. `communicate` does nothing special in this case (at least prior to 3.3): http://hg.python.org/cpython/file/3a1db0d2747e/Lib/subprocess.py#l767 In 3.3, the new `timeout` option for `communicate` also uses the select/thread implementation. stdout FILE stream buffering could be a problem if output is intermittent and the program doesn't `fflush` the buffer. On Linux the `stdbuf` program may be able to circumvent this. It injects code (i.e. libstdbuf.so is added to LD_PRELOAD) that calls `setvbuf` before the target's `main` runs. This allows you to set the stream to line buffering mode (unless the program itself calls `setvbuf`). I don't think a similar utility exists on Windows. http://linux.die.net/man/1/stdbuf ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Question about subprocess
On Sat, Jan 11, 2014 at 12:51 AM, Steven D'Aprano st...@pearwood.info wrote: However, when I writed it into a .py file and execute the .py file, it blocked at temp=p.readline(). Of course it does. You haven't actually called the .exe file, all you have done is created a Popen instance and then grabbed a reference to it's stdout. Then you sit and wait for stdout to contain data, which it never does. Popen.__init__ calls Popen._execute_child, which on Windows is defined to call _subprocess.CreateProcess. So the issue can't be that the OP hasn't called the .exe. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Question about subprocess
On Fri, Jan 10, 2014 at 11:48 PM, daedae11 daeda...@126.com wrote: p = subprocess.Popen(['E:/EntTools/360EntSignHelper.exe', 'E:/build/temp/RemoteAssistSetup.exe'], stdout=subprocess.PIPE, shell=True).stdout Is 360EntSignHelper supposed to run RemoteAssistSetup as a child process? Or rather is it that from the command line you're piping the output from the former into the latter? You'll need to provide more information about what you mean by running the code in command line. Some general suggestions: Remove shell=True. There's no reason to involve the shell here. subprocess hides the window when you use shell=True, so maybe that's why you're using it. But you can do that by setting the startupinfo parameter to the following: si = subprocess.STARTUPINFO() si.dwFlags |= subprocess.STARTF_USESHOWWINDOW si.wShowWindow = subprocess.SW_HIDE Also, as a matter of style, `p` is a bad name for stdout. It's not an instance of [P]open representing a process. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Question about subprocess
On Sat, Jan 11, 2014 at 04:26:00AM -0500, eryksun wrote: On Sat, Jan 11, 2014 at 12:51 AM, Steven D'Aprano st...@pearwood.info wrote: However, when I writed it into a .py file and execute the .py file, it blocked at temp=p.readline(). Of course it does. You haven't actually called the .exe file, all you have done is created a Popen instance and then grabbed a reference to it's stdout. Then you sit and wait for stdout to contain data, which it never does. Popen.__init__ calls Popen._execute_child, which on Windows is defined to call _subprocess.CreateProcess. So the issue can't be that the OP hasn't called the .exe. Thanks for the correction. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Windows Install Issue
Hi I'm trying to install pyqt5.2 for Windows Vista (Python3.3). 1st i need to install sip but i run into this issue. after ./configure, a MAKEFILE is created. I'm supposed to do 'make' and 'make install', but i get this cmd error: C:\pathmake 'make' is not recognized as an internal or external command, operable program or batch file. I'm not really sure what i should do? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Windows Install Issue
On 11/01/2014 14:08, Matthew Ngaha wrote: Hi I'm trying to install pyqt5.2 for Windows Vista (Python3.3). 1st i need to install sip but i run into this issue. after ./configure, a MAKEFILE is created. I'm supposed to do 'make' and 'make install', but i get this cmd error: C:\pathmake 'make' is not recognized as an internal or external command, operable program or batch file. I'm not really sure what i should do? On Windows finding a binary installer is always the first thing to do, makefiles indeed. Go here http://www.riverbankcomputing.co.uk/software/pyqt/download5, find the section Binary Packages and this gives Windows 32 and 64 bit installers. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Windows Install Issue
On Sat, Jan 11, 2014 at 2:55 PM, Mark Lawrence breamore...@yahoo.co.uk wrote: On Windows finding a binary installer is always the first thing to do, makefiles indeed. Go here http://www.riverbankcomputing.co.uk/software/pyqt/download5, find the section Binary Packages and this gives Windows 32 and 64 bit installers. sorry i forgot to explain. i cant get the binary: http://www.riverbankcomputing.co.uk/software/pyqt/download5 Unfortunately it is not possible to use both the PyQt4 and PyQt5 installers at the same time. If you wish to have both PyQt4 and PyQt5 installed at the same time you will need to build them yourself from the source packages. after seeing this i thought it was better not to try it and maybe currupt my files ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Windows Install Issue
On 11/01/2014 15:24, Matthew Ngaha wrote: On Sat, Jan 11, 2014 at 2:55 PM, Mark Lawrence breamore...@yahoo.co.uk wrote: On Windows finding a binary installer is always the first thing to do, makefiles indeed. Go here http://www.riverbankcomputing.co.uk/software/pyqt/download5, find the section Binary Packages and this gives Windows 32 and 64 bit installers. sorry i forgot to explain. i cant get the binary: http://www.riverbankcomputing.co.uk/software/pyqt/download5 Unfortunately it is not possible to use both the PyQt4 and PyQt5 installers at the same time. If you wish to have both PyQt4 and PyQt5 installed at the same time you will need to build them yourself from the source packages. after seeing this i thought it was better not to try it and maybe currupt my files http://stackoverflow.com/questions/16846501/how-to-install-pyqt5-on-windows -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Question
It will also be helpful if you tell us your OS and Python Version. Can you also tell us if you are writing the code to a file and executing, using IDLE or some other IDE, or are you using the interpreter interactively? On Fri, Jan 10, 2014 at 8:57 PM, Amy Davidson amydavid...@sympatico.ca wrote: Hey Danny, I just started taking the course (introduction to Computer Science) on last Tuesday, so I am not to familiar. I have been doing my best to understand the material by reading the text book, Learn Python the hard way. In my quest to answer the question given to me, I have searched the internet high and low of other functions thus, I am familiar with the basic knowledge of them (i.e. starting with def) as well as examples. We can attempt the approach to the method that you prefer. Thans for helping me, by the way. On Jan 10, 2014, at 5:25 PM, Danny Yoo d...@hashcollision.org wrote: On Fri, Jan 10, 2014 at 2:00 PM, Keith Winston keithw...@gmail.com wrote: Amy, judging from Danny's replies, you may be emailing him and not the list. If you want others to help, or to report on your progress, you'll need to make sure the tutor email is in your reply to: Hi Amy, Very much so. Please try to use Reply to All if you can. If you're wondering why I'm asking for you to try to recall any other example function definitions, I'm doing so specifically because it is a general problem-solving technique. Try to see if the problem that's stumping you is similar to things you've seen before. Several of the heuristics from Polya's How to Solve It refer to this: http://en.wikipedia.org/wiki/How_to_Solve_It If you haven't ever seen any function definition ever before, then we do have to start from square one. But this would be a very strange scenario, to be asked to write a function definition without having seen any previous definitions before. If you have seen a function before, then one approach we might take is try to make analogies to those previous examples. That's an approach I'd prefer. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Question
Hey! So luckily with the texts that were sent to me, I was able to figure out the answer(yay)! Unfortunately I am now stuck on a different question. Write a function called highlight() that prompts the user for a string. Your code should ensure that the string is all lower case. Next, prompt the user for a smaller 'substring' of one or more characters. Then replace every occurrence of the substring in the first string with an upper case. Finally, report to the user how many changes were made (i.e., how many occurrences of the substring there were).” On Jan 11, 2014, at 1:04 AM, Alex Kleider aklei...@sonic.net wrote: On 2014-01-10 17:57, Amy Davidson wrote: Hey Danny, I just started taking the course (introduction to Computer Science) on last Tuesday, so I am not to familiar. I have been doing my best to understand the material by reading the text book, Learn Python the hard way. A lot of people seem to think the Hard Way is the way to go. I disagree. I found that Allen Downey's book is excellent and free (although the book is also available in 'real' print which works better for me.) http://www.greenteapress.com/thinkpython/ My copy covers Python 2.7, you use Python 3 I believe, but I doubt that that will be too much of a problem. At the intro level the differences are few. ak In my quest to answer the question given to me, I have searched the internet high and low of other functions thus, I am familiar with the basic knowledge of them (i.e. starting with def) as well as examples. We can attempt the approach to the method that you prefer. Thans for helping me, by the way. On Jan 10, 2014, at 5:25 PM, Danny Yoo d...@hashcollision.org wrote: On Fri, Jan 10, 2014 at 2:00 PM, Keith Winston keithw...@gmail.com wrote: Amy, judging from Danny's replies, you may be emailing him and not the list. If you want others to help, or to report on your progress, you'll need to make sure the tutor email is in your reply to: Hi Amy, Very much so. Please try to use Reply to All if you can. If you're wondering why I'm asking for you to try to recall any other example function definitions, I'm doing so specifically because it is a general problem-solving technique. Try to see if the problem that's stumping you is similar to things you've seen before. Several of the heuristics from Polya's How to Solve It refer to this: http://en.wikipedia.org/wiki/How_to_Solve_It If you haven't ever seen any function definition ever before, then we do have to start from square one. But this would be a very strange scenario, to be asked to write a function definition without having seen any previous definitions before. If you have seen a function before, then one approach we might take is try to make analogies to those previous examples. That's an approach I'd prefer. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] need help
On 11/01/2014 14:52, S Tareq wrote: how can i do this on python using py game: No idea as what you've sent isn't readable when you try to reply. Also I can't see any code so sorry but I'm not doing your homework for you :( -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Question
hey amy.. ok.. before we jump to coding (and forgive me if what I'm about to type is really basic!) let's play a bit with what's called psuedo-code. psuedo-code is a technique to kind of put your thoughts about a problem/approach in a hash of code/english.. kind of lets you lay out what you're trying to solve/program. so for you issue: you need to think about what you're trying to do. you want to give the user back something, based on you doing something to the thing the user gives you. so this means, you need some way of getting user input you want to do something to the input, so you need some way of capturing the input to perform the something (better known as an operation) on the user's input.. then you want to redisplay stuff back to the user, so you're going to need a way of displaying back to the user the data/output.. create the psuedo-code, post it, and we'll get this in no time! On Sat, Jan 11, 2014 at 12:23 PM, Amy Davidson amydavid...@sympatico.ca wrote: Hey! So luckily with the texts that were sent to me, I was able to figure out the answer(yay)! Unfortunately I am now stuck on a different question. Write a function called highlight() that prompts the user for a string. Your code should ensure that the string is all lower case. Next, prompt the user for a smaller 'substring' of one or more characters. Then replace every occurrence of the substring in the first string with an upper case. Finally, report to the user how many changes were made (i.e., how many occurrences of the substring there were).” On Jan 11, 2014, at 1:04 AM, Alex Kleider aklei...@sonic.net wrote: On 2014-01-10 17:57, Amy Davidson wrote: Hey Danny, I just started taking the course (introduction to Computer Science) on last Tuesday, so I am not to familiar. I have been doing my best to understand the material by reading the text book, Learn Python the hard way. A lot of people seem to think the Hard Way is the way to go. I disagree. I found that Allen Downey's book is excellent and free (although the book is also available in 'real' print which works better for me.) http://www.greenteapress.com/thinkpython/ My copy covers Python 2.7, you use Python 3 I believe, but I doubt that that will be too much of a problem. At the intro level the differences are few. ak In my quest to answer the question given to me, I have searched the internet high and low of other functions thus, I am familiar with the basic knowledge of them (i.e. starting with def) as well as examples. We can attempt the approach to the method that you prefer. Thans for helping me, by the way. On Jan 10, 2014, at 5:25 PM, Danny Yoo d...@hashcollision.org wrote: On Fri, Jan 10, 2014 at 2:00 PM, Keith Winston keithw...@gmail.com wrote: Amy, judging from Danny's replies, you may be emailing him and not the list. If you want others to help, or to report on your progress, you'll need to make sure the tutor email is in your reply to: Hi Amy, Very much so. Please try to use Reply to All if you can. If you're wondering why I'm asking for you to try to recall any other example function definitions, I'm doing so specifically because it is a general problem-solving technique. Try to see if the problem that's stumping you is similar to things you've seen before. Several of the heuristics from Polya's How to Solve It refer to this: http://en.wikipedia.org/wiki/How_to_Solve_It If you haven't ever seen any function definition ever before, then we do have to start from square one. But this would be a very strange scenario, to be asked to write a function definition without having seen any previous definitions before. If you have seen a function before, then one approach we might take is try to make analogies to those previous examples. That's an approach I'd prefer. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] need help
Hi, On 11 January 2014 14:52, S Tareq stare...@yahoo.com wrote: how can i do this on python using py game: You need to tell us more about what you've tried and where you're stuck. Needless to say we're not a solution provision service, but we'd be happy to help you get unstuck if you've already done some programming and have gotten to a point where you're actually stuck. :) For the reference of others, I've managed to track down the full task description here: http://www.kirkbiekendal.cumbria.sch.uk/index.php/public-documents/school/general-information?download=339:2014-component-1-gaming-scenario-candidate-booklet As this is therefore clearly homework that you'll be handing in, please note we absolutely cannot provide you with concrete solutions to this assignment. As to your reference to PyGame -- I'd like to gently suggest that perhaps you should not worry about PyGame if you're just starting out. You can get started without it and build a more basic solution first (maybe just simple text mode) and then deal with whether you want to enhance/modify your solution to use PyGame at some later time. Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] python query
Hi All, I would like to know the difference between GUI programming v/s web designing...To be more specific lets compare Django(used for web programming) v/s Tkinter(used for GUI programming) I wish to have a more clear difference regarding this. Regards, Reuben ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python query
On 11/01/14 18:53, Reuben wrote: I would like to know the difference between GUI programming v/s web designing...To be more specific lets compare Django(used for web programming) v/s Tkinter(used for GUI programming) What do you mean by the difference in programming? Do you want to know about the programming paradigms or the difference in deployment or the difference in the nature of the apps (I hope you already understand that but maybe not...) Django is on the web so all the interactions take place over a network. The UI is displayed in a browser which interprets HTML sent from the server. Because of the relatively long latency between client and server web apps tend to be slower and less responsive than desktop apps. To get round that they tend to cram more into a single screen. More modern apps also move a lot of functionality into Javascript on the browser and rely on lightweight protocols like JSON to fetch data from the server(this is known as Ajax style programming) Tkinter is a desktop GUI toolkit where the application responds to users events and draws pictures(widgets) on the screen. All logic and display happens locally, although some apps communicate with a server somewhere (this is called client server design). OK, That's a start, what specifically do you want beyond that? -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tutor Digest, Vol 115, Issue 28
On 12/01/14 00:17, Jerry Val wrote: I am trying to perfect myself in creating functions and looping, am using python 3,can you help me with a few basic tips so i can create my own functions and loops without making random mistakes?! Please set a meaningful subject line, it makes finding posts in the archive much easier. Also do not send the full digest content. a) Most folks have already received the messages and don't want to see them, again b) some folks pay for their bandwidth and don't want to pay for stuff they don't need c) it obscures your message. Always cut it down to the lines that are pertinent. That way you are more likely to get sensible answers. And for bonus points put your question after the cited context. Most readers prefer that to so called top posting. As to your question. The best advice is to read what you type carefully. And know what you are trying to do before you type it. In other words, think about the design of your code don't just type randomly. That way you are less likely to get random errors. Other than that we will need some more specifics about what kind of errors you are getting. Usually most folks make the same kind of errors over and over. But the kind varies by individual. So until we know your style we can't help much. HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Basic tips - was Re: Tutor Digest, Vol 115, Issue 28
On 12/01/2014 00:17, Jerry Val wrote: I am trying to perfect myself in creating functions and looping, am using python 3,can you help me with a few basic tips so i can create my own functions and loops without making random mistakes?! IMHO the most important thing is to try your code snippets at the interactive prompt. The second most important thing to get help here is *NOT* to reply to a four month old digest without changing the title, and worse still sending the whole completely irrelevant contents. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tutor Digest, Vol 115, Issue 28
I am trying to perfect myself in creating functions and looping, am using
python 3,can you help me with a few basic tips so i can create my own
functions and loops without making random mistakes?!
On Sep 12, 2013 11:19 PM, tutor-requ...@python.org wrote:
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Today's Topics:
1. Re: class data member and objects of class in python
(Felix Dietrich)
2. Re: class data member and objects of class in python (zubair alam)
3. Re: class data member and objects of class in python (Alan Gauld)
4. Re: Tutor Digest, Vol 115, Issue 27 (Dino Bekte?evi?)
5. Re: class data member and objects of class in python (Dave Angel)
--
Message: 1
Date: Thu, 12 Sep 2013 02:59:51 +0200
From: Felix Dietrich felix.dietr...@sperrhaken.name
To: tutor@python.org
Subject: Re: [Tutor] class data member and objects of class in python
Message-ID: 87hadqx3aw@sperrhaken.name
Content-Type: text/plain
i am learning how a __class__ data member behaves in python as
compared to static data member in java [...]
The error is not related to class variables. Also could you elaborate on
what you intended to find out with this snippet?
class PizzaShop():
pizza_stock = 10
def get_pizza(self):
while not PizzaShop.pizza_stock:
PizzaShop.pizza_stock -= 1
yield take yours pizza order, total pizzas left
{}.format(PizzaShop.pizza_stock)
The condition in the while loop is wrong. bool(PizzaShop.pizza_stock) is
True for all values but 0. (All numbers but 0 are considered True.) The
while loop does its commands while the condition holds True. When you do
not PizzaShop.pizza_stock
it will return False for values other than 0, therefor the loop is never
run and on exit of get_pizza it raises StopIteration to indicate that
there are no more values to be yielded.
mypizza_shop = PizzaShop()
pizza_order = mypizza_shop.get_pizza() # iterator is obtained
print a pizza pls!! {}:.format(pizza_order.next())
print a pizza pls!! {}:.format(pizza_order.next())
You might want to catch StopIteration here so that you can handle the
case that the shop runs out of the initial stack of pizzas. ;)
--
Felix Dietrich
--
Message: 2
Date: Thu, 12 Sep 2013 14:40:08 +0530
From: zubair alam zubair.alam@gmail.com
To: Marc Tompkins marc.tompk...@gmail.com
Cc: tutor tutor@python.org
Subject: Re: [Tutor] class data member and objects of class in python
Message-ID:
cagqec76+un1_+yw3uc78f10nj8uszdpgtd90jnbkuxpo2ba...@mail.gmail.com
Content-Type: text/plain; charset=iso-8859-1
class PizzaShop():
pizza_stock = 10
def get_pizza(self):
while PizzaShop.pizza_stock:
PizzaShop.pizza_stock -= 1
yield take yours pizza order, total pizzas left
{}.format(PizzaShop.pizza_stock)
mypizza_shop = PizzaShop()
pizza_order = mypizza_shop.get_pizza()
# print {}.format(repr(pizza_order.next()))
for order in pizza_order:
print {}.format(repr(order))
domino_pizza_store = mypizza_shop.get_pizza()
print {}.format(repr(domino_pizza_store.next()))
mypizza_shop.pizza_stock = 10
domino_pizza_store = mypizza_shop.get_pizza()
print {}.format(repr(domino_pizza_store.next()))
can't we again use the same object mypizza_shop once its generator is
exhausted
On Thu, Sep 12, 2013 at 6:53 AM, Marc Tompkins marc.tompk...@gmail.com
wrote:
On Wed, Sep 11, 2013 at 5:40 AM, zubair alam zubair.alam@gmail.com
wrote:
i am learning how a __class__ data member behaves in python as compared
to static data member in java, but following code is throwing error
class PizzaShop():
pizza_stock = 10
def get_pizza(self):
while not PizzaShop.pizza_stock:
PizzaShop.pizza_stock -= 1
yield take yours pizza order, total pizzas left
{}.format(PizzaShop.pizza_stock)
mypizza_shop = PizzaShop()
pizza_order = mypizza_shop.get_pizza() # iterator is obtained
print a pizza pls!! {}:.format(pizza_order.next())
print a pizza pls!! {}:.format(pizza_order.next())
output:
Traceback (most recent call last):
File /home/scott/pythonfiles/core_python/pizza.py, line 10, in
module
print a pizza pls!! {}:.format(pizza_order.next())
StopIteration
don't know where i am doing mistakeany help will be appreciated... i
have other questions on based on this class
Change while not
Re: [Tutor] another better way to do this ?
On 11/01/14 21:24, Roelof Wobben wrote: I have two strings a and b Now I have to check if the characters of b are all in a. But they do have to be in the same order. I'm not sure exactly what you mean? Can you give some examples of data that pass and that fail the criteria? Your algorithm below might meet one definition of the spec but its not valid code since it uses return but is not a function. length = len(b) start = 1 while start length : check = a.find (b[start]) if check == -1 : return False start = start + 1 return True Problems I see are: 1) you start testing at b[1] not b[0] 2) you don't check if the letters are in the same sequence in a as in b 3) you probably could tidy it up using a for loop over b rather than indexing But according to the site this can be solved in a one-liner. That depends on the spec. And have you covered regular expressions? That is probably one way to do a one-liner... But just because you can do it in one line doesn't mean you should. It's better for code to be readable than short. HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] another better way to do this ?
Hello, I try to learn python by following the audicity page. Now I have the following problem. I have two strings a and b Now I have to check if the characters of b are all in a. But they do have to be in the same order. So I thought about this solution. length = len(b) start = 1 while start length : check = a.find (b[start]) if check == -1 : return False start = start + 1 return True But according to the site this can be solved in a one-liner. So can someone give me pointers how this can be done and if my solution can work. Roelof ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Windows Install Issue
On Sat, Jan 11, 2014 at 10:24 AM, Matthew Ngaha chigga...@gmail.com wrote: Unfortunately it is not possible to use both the PyQt4 and PyQt5 installers at the same time. If you wish to have both PyQt4 and PyQt5 installed at the same time you will need to build them yourself from the source packages. after seeing this i thought it was better not to try it and maybe currupt my files The pre-built versions of PyQt4 and PyQt5 don't use the same version of SIP. If you don't have a build system (e.g. Visual Studio 2010, the Windows 7 SDK, or MinGW), then using a virtual environment should work around the problem. http://docs.python.org/3/library/venv.html Install PyQt4, and then copy the following files and directories to a separate environment: Python33\qt.conf Python33\Lib\site-packages\sip.pyd Python33\Lib\site-packages\PyQt4 Copy the qt.conf file to the environment's Scripts, and update the absolute paths it contains to the new PyQt4 directory. Also edit qt.conf and pyuic4.bat in the PyQt4 directory. Then uninstall PyQt4 and install PyQt5. This would be simpler if PyQt used a bdist_wininst installer that works with easy_install. Apparently PySide does. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Windows Install Issue
On Sun, Jan 12, 2014 at 1:13 AM, eryksun eryk...@gmail.com wrote: The pre-built versions of PyQt4 and PyQt5 don't use the same version of SIP. If you don't have a build system (e.g. Visual Studio 2010, the Windows 7 SDK, or MinGW), then using a virtual environment should work around the problem. http://docs.python.org/3/library/venv.html Install PyQt4, and then copy the following files and directories to a separate environment: Problem solved. Thanks so much:) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] another better way to do this ?
On Jan 11, 2014, at 4:24 PM, Roelof Wobben wrote: Hello, I try to learn python by following the audicity page. Now I have the following problem. I have two strings a and b Now I have to check if the characters of b are all in a. But they do have to be in the same order. Perhaps they are looking for something like: 'abc' in 'someotherabcstring' True I suspect that you'll want to figure out how to do that same task with variables now :) Take care, Don ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tutor Digest, Vol 115, Issue 28
On Sat, Jan 11, 2014 at 7:37 PM, Alan Gauld alan.ga...@btinternet.com wrote: In other words, think about the design of your code don't just type randomly. I prefer the million monkeys at a million typewriters approach to coding... But then, it's all I've tried... -- Keith ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
