Re: [Tutor] .py vs .pyc
Then if I understand correctly, I work with .py files and (should) run them as .pyc files? On Thu, Apr 19, 2012 at 10:55 AM, Russel Winder wrote: > On Thu, 2012-04-19 at 10:47 -0400, Max S. wrote: > > Could anyone tell me why I should use a .pyc file rather than a .py? > After > > doing some research, I have found that a .py file is first precompiled > and > > then run, while a .pyc file is already precompiled and is simply run. > But > > unless I'm mistaken, it seems that a .pyc is no faster or better than a > .py > > file. When should I use a .py, and when should I use a .pyc? > > pyc files are just internal PVM files. Although they appear on the > filestore visible to the programmer, just leave management of them to > the PVM. Humans deal only with .py files -- or possibly pyx if you are > using Cython. > > -- > Russel. > > = > Dr Russel Winder t: +44 20 7585 2200 voip: > sip:russel.win...@ekiga.net > 41 Buckmaster Roadm: +44 7770 465 077 xmpp: rus...@winder.org.uk > London SW11 1EN, UK w: www.russel.org.uk skype: russel_winder > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] .py vs .pyc
Could anyone tell me why I should use a .pyc file rather than a .py? After doing some research, I have found that a .py file is first precompiled and then run, while a .pyc file is already precompiled and is simply run. But unless I'm mistaken, it seems that a .pyc is no faster or better than a .py file. When should I use a .py, and when should I use a .pyc? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Extremely simple question
I believe that line 3 raises an error. The because you contained the text
in single quotes, and then used the same character in 'you're not chris',
Python believes that you are trying to type "you" re not chris". You can
change the single quotes surrounding your string to double quotes ("you're
not chris"), triple-single quotes ('''you're not chris'''), or
triple-double quotes ("""you're not chris"""), or you can tell Python that
you want to include the apostrophe in your string by preceding it with a \
('you\'re not chris'). The latter works on the same idea as \n and \t.
On Wed, Jan 11, 2012 at 6:04 AM, col speed wrote:
>
> > your_weight = int(raw_input("Please enter your weight: "))
> > if your_weight < 0:
> > print 'You're not Chris!'
> > elif your_weight == 170:
> > print 'You might be Chris! But...'
> > your_height = int(raw_input("Please enter your height: "))
> > if your_height < 180:
> > print 'You're not Chris!
> > elif your_height == 180:
> > print 'You're Chris!'
> > your_name = int(raw_input("What is your name? "))
> > elif your_height > 180:
> > print 'You're not Chris!"
> > elif x > 170:
> > print 'You're not Chris!'
>
>
> When I open it, the program says I have a syntax error. Praytell,
> where
> did
> I go wrong?n
> I'm a newbie, but I get "NameError" because 'x' is not defined.
> Also "your_name = int(raw_input("What is your name? "))" will give this :
> ValueError: invalid literal for int() with base 10: 'name'.
> As you can't change a string to be an int.
> I can't find a syntax error, but next time, please paste the whole
> traceback as this helps people with less time than me to sort out
> problems.
>
> Good luck with Python
> Col
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Re: [Tutor] beginner here
You are using an 'elif' for your 'coin_rolls == 1:'. The 'elif' keyword
means that if the last 'if' statement (and any 'elif's behind it) was *not*
true, only then will it be executed. Your code could be written as 'if
rolls is NOT less than or equal to 100, only then check to see if it is 1
or 2'. Replace your first 'elif' with 'if', and it should work.
On Wed, Dec 7, 2011 at 8:17 PM, Do youknow who wrote:
> Im trying to write this program where i make it flip a coin 100 times then
> tells me the number of heads and tails it came up with.
>
> this is what I got but it does not run
>
> # Coin Flip
> # Demonstrating the While loop
> import random
> print("I will flip a coin 100 times and tell you")
> print(", how many heads and how many tails I got.")
> coin_rolls = random.randint(1,2)
> heads = 0
> tails = 0
> rolls = 0
>
> if rolls <= 100:
> rolls += 1
>
> elif coin_rolls == 1:
> heads += 1
> elif coin_rolls == 2:
> tails += 1
> else:
> print("error")
> print("There was ", heads, "rolls for heads,")
> print("\nand there was ", tails, " rolls for tails.")
> input("\n\nPress the enter key to exit.")
>
> I end up with 0 rolls for heads and 0 rolls for tails...I have made
> attempts to put the
> "coin_rolls = random.randint(1,2)" within the loops but only end up with
> errors
> what wrong with my code?
>
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[Tutor] Saving read-only or encoded text files?
Hi. I've been using a lot of text files recently, and I'm starting to worry about a user hacking some element by editing the text files. I know that I can pickle my data instead, creating less easily editable (try saying that five times fast) .dat files, but I'd rather store individual variables rather than lists of objects. Is there a way to make my text files either read-only or saved in some way that they can't be opened, or at least not so easily as double-clicking on them? I just want some slightly more secure code, though it's not too important. I just thought I'd ask. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Encoding
Well, I am assuming that by this you mean converting user input into a
string, and then extracting the numerals (0-9) from it. Next time, please
tell us your version of Python. I'll do my best to help with this. You
might try the following:
the_input = input("Insert string here: ") # change to raw_input in python 2
after = ""
for char in the_input:
try:
char = int(char)
except:
after += char
If other symbols might be in the string ($, @, etc.), then you might use
the_input = input('Insert string here: ') # change to raw_input in python 2
after = ''
not_allowed = '1234567890-=!@#$%^&**()_+,./<>?`~[]{}\\|'
for char in the_input:
if char in not_allowed:
pass
else:
after += char
This method requires more typing, but it works with a wider variety of
characters. Hopefully this helped.
On Thu, Nov 17, 2011 at 8:45 PM, Nidian Job-Smith wrote:
>
> Hi all,
>
> In my programme I am encoding what the user has in-putted.
>
> What the user inputs will in a string, which might a mixture of letters
> and numbers.
>
> However I only want the letters to be encoded.
>
>
> Does any-one how I can only allow the characters to be encoded ??
>
> Big thanks,
>
>
>
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Re: [Tutor] sifting through a long program
Alt+G, or Edit>Go To Line. On Thu, Nov 10, 2011 at 1:58 PM, Nathaniel Trujillo wrote: > How do I get to line 362 of a program without counting each line ? Thanks > for the help. > ___ > 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] Accessing methods in same class
Oh. Sorry. It's 500 lines, so I'll just post an example. Windows Vista
and Python 3, just because I forgot.
class K:
def __init__(self): doThis()
def doThis(self): print("Hi.")
k = K()
>From what I understand by your help, the code
class K:
def __init__(self): self.doThis()
def doThis(self): print("Hi.")
k = K()
should work. Thank you for coping with my lack of code to work with.
On Sun, Nov 6, 2011 at 4:23 PM, Peter Lavelle
wrote:
> Hi,
>
> Could you post a copy of the code you are working on, so we can help you
> better with this?
>
> Usually, when calling a method in the same class you use the syntax:
> self.method_name()
>
> 'self' refers to an attribute or method within the same class.
>
> Sorry, if this does not help you.
>
> Regards
>
> Peter Lavelle
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[Tutor] Accessing methods in same class
Hi. I'm working on a project for my friend, but I'm running into errors. No matter what I do, I can't seem to get one method to execute another method in the same class. Is there a way that I can do this? Thanks. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Assigning variables with names set by other variables
Is it possible to create a variable with a string held by another variable
in Python? For example,
>>> var_name = input("Variable name: ")
(input: 'var')
>>> var_name = 4
>>> print(var)
(output: 4)
(Yeah, I know that if this gets typed into Python, it won't work. It just
pseudocode.)
I'm on a Windows Vista with Python 3.2.2. Thanks.
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Re: [Tutor] Tutor Digest, Vol 92, Issue 77
On Sun, Oct 16, 2011 at 3:44 PM, wrote:
> Send Tutor mailing list submissions to
>tutor@python.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>http://mail.python.org/mailman/listinfo/tutor
> or, via email, send a message with subject or body 'help' to
>tutor-requ...@python.org
>
> You can reach the person managing the list at
>tutor-ow...@python.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Tutor digest..."
>
>
> Today's Topics:
>
> 1. Re: Bounded Linear Search (tog...@users.sourceforge.net)
> 2. Re: Can I set LD_LIBRARY_PATH within a .py file?
> (Albert-Jan Roskam)
> 3. Re: Socket and Ports (Jacob Bender)
> 4. 6 random numbers (ADRIAN KELLY)
>
>
> --
>
> Message: 1
> Date: Sun, 16 Oct 2011 19:04:41 +0200
> From: tog...@users.sourceforge.net
> To: tutor@python.org
> Subject: Re: [Tutor] Bounded Linear Search
> Message-ID:
> Content-Type: text/plain; charset="ISO-8859-1"
>
> Peter Otten wrote:
>
> > To verify that the algorithm is correct now you could walk through
> > increasingly more complex sample data, which may be possible in this
> case,
> > but rarely ever for an entire script. Instead the common approach is to
> > pick a few samples along with the expected outcomes, feed them to your
> > function and verify that they give the expected output
> >
> > def unique_values(items):
> >...
> >return uniq
> >
> > assert unique_values([42, 42]) == [42]
> > assert unique_values([1, 2, 3, 2]) == [1, 2, 3]
>
> Thanks for the tip and where I was failing to see
>
> Togan
>
>
>
> --
>
> Message: 2
> Date: Sun, 16 Oct 2011 11:25:44 -0700 (PDT)
> From: Albert-Jan Roskam
> To: Hugo Arts
> Cc: Python Mailing List
> Subject: Re: [Tutor] Can I set LD_LIBRARY_PATH within a .py file?
> Message-ID:
><1318789544.84883.yahoomail...@web110709.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Hugo,
> ?
> You are absolutely right. Thank you! It took me a lot of reading and
> tinkering to find out that typing the following in the terminal works:
> export LD_LIBRARY_PATH=\path\to\the\lib
> python main.py # contains import to my program + calls to the functions in
> it.
> ?
> I find it strange though, that ctypes.CDLL() does not accept library names
> *with the full path*. In Linux, you could do it, but it seems that all the
> dependencies of the libary in that non-standard location are looked for ONLY
> in that non-standard location.
>
> Cheers!!
> Albert-Jan
>
>
> ~~
> All right, but apart from the sanitation, the medicine, education, wine,
> public order, irrigation, roads, a fresh water system, and public health,
> what have the Romans ever done for us?
> ~~
>
> From: Hugo Arts
> >To: Albert-Jan Roskam
> >Cc: Python Mailing List
> >Sent: Sunday, October 16, 2011 1:22 AM
> >Subject: Re: [Tutor] Can I set LD_LIBRARY_PATH within a .py file?
> >
> >On Sat, Oct 15, 2011 at 9:51 PM, Albert-Jan Roskam
> wrote:
> >> Hello,
> >> Can I set the LD_LIBRARY_PATH environment variable (on-the-fly) within a
> .py
> >> file?
> >> I would like to use an .so-file that lives in a non-standard location.
> >>
> >> This does not work:
> >> try:
> >> ?? os.environ["LD_LIBRARY_PATH"]? += (":" + path)
> >> except KeyError:
> >> ?? os.environ["LD_LIBRARY_PATH"] = path
> >> Currently, I can only run the program in the terminal:
> >> export LD_LIBRARY_PATH=/home/dude/Desktop/test
> >> python /home/dude/Desktop/testLoadLibLinux.py
> >> This works (yaaayy!), but I'd like to run the .py file directly.
> >> Is this possible? I also don't? like the fact that I can't test the .py
> file
> >> in Idle.
> >> Perhaps a complicating factor is a bug in LD_LIBRARY_PATH
> >> in Linux Ubuntu 10 (the version I'm using):
> >> https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/366728
> >> https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/366728/comments/21
> >> solution:
> >> sudo gedit /etc/X11/Xsession.options
> >> (change "use-ssh-agent" into "no-use-ssh-agent")
> >>
> >> Thank you in advance for your thoughts!
> >>
> >> Cheers!!
> >> Albert-Jan
> >>
> >
> >Alright, I'm not going to pretend to be an expert on this one, a bit
> >of this is speculation and inference from what I know about dynamic
> >linking. In short, I don't think you can modify LD_LIBRARY_PATH on the
> >fly and have it actually work. The reason for this is that the linker
> >runs and finds all the libraries *before* the python process actually
> >starts. So by the time you go and modify the environment, all
> >libraries have already been linked, and your modified variable is
> >never even read by the linker.
> >
> >So the best you can do is write a tiny wrapper to set LD_LIBRARY_PATH
> >and then run y
[Tutor] 'object' class
I have seen classes created with 'class Class_Name:' and 'class Class_Name(object):'. I'm using the latter, just in case it has some sort of method that could be useful that I don't know about, but *are *there any methods in the 'object' class? And if so, what are they? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Generic For Loop
Thanks!
On Wed, Oct 12, 2011 at 8:56 PM, bob gailer wrote:
> On 10/12/2011 8:41 PM, Max S. wrote:
>
>> I've been doing some research into C++, and I've noticed the for loops.
>> Is there a way to use the C++ version of the loops instead of the Python
>> one? For example, I believe that the Python syntax would be:
>> for a=1, a < 11, a += 1:
>>print(a)
>> print("Loop ended.")
>> if the 'for' keyword did it's function as in C++, Actionscript, or most
>> other programming languages. Is there a way to do this?
>>
>
> for i in range(1, 11, 1): # the final 1 can be omitted, as it is the
> default value.
> loop body
>
> OR
>
> i = 1
> while i < 11:
> i += 1
> loop body
>
> Your choice - that's all know of - and the for is easier to read and write
> than the while.
>
> --
> Bob Gailer
> 919-636-4239
> Chapel Hill NC
>
>
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[Tutor] Generic For Loop
I've been doing some research into C++, and I've noticed the for loops. Is
there a way to use the C++ version of the loops instead of the Python one?
For example, I believe that the Python syntax would be:
for a=1, a < 11, a += 1:
print(a)
print("Loop ended.")
if the 'for' keyword did it's function as in C++, Actionscript, or most
other programming languages. Is there a way to do this?
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