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• Python match and return string in between

  - by Peter S.

  I have stringA = "xxxxxxFoundAaaaaaaaaaaaaaaFoundBxxxxxxx" stringB = "FoundA" stringC = "FoundB" How do I do a regular expression in python in order to return aaaaaaaaaaaaaa? Please help. Thanks in advance.

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• [python] parsing a string based on specified identifiers

  - by jml

  Let's say that I have the following text: in = "one aaa two bbbb three cccc" I would like to parse this into a group of variables that contain notworking = ["one", "two", "three"] v1,v2,v3 = in.split(notworking) I know that the example above won't work, but is there some utility in python that would allow me to use this sort of approach? I know what the identifiers will be in advance, so I would think that there has got to be a way to do this... Thanks for any help, jml

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• Python initialization and circular reference counts

  - by eric

  Can we initialize python objects with statement like this: a = b = c = None it seems to me when I did a = b = c = list() will cause circular reference count issue. Please give your expert advice.

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• Python new-style classes and __subclasses__ function

  - by Fraser Graham

  Can somebody explain to me why this works (in Python 2.5) : class Foo(object): pass class Bar(Foo): pass print(Foo.__subclasses__()) but this doesn't : class Foo(): pass class Bar(Foo): pass print(Foo.__subclasses__()) The latter returns "AttributeError: class Foo has no attribute '__subclasses__'" but i'm not sure why. I know this is related to old-style vs. new-style classes but i'm not clear on why that would make this functionality unavailable.

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• [python] traversing an object tree

  - by jml

  Hi there, I'm trying to find information on different ways to traverse an object tree in python. I don't know much about the language in general yet, so any suggestions/techniques would be welcome. Thanks so much jml

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• Cross platform /dev/null in Python

  - by Tristan

  I'm using the following code to hide stderr on Linux/OSX for a Python library I do not control that writes to stderr by default: f = open("/dev/null","w") zookeeper.set_log_stream(f) Is there an easy cross platform alternative to /dev/null? Ideally it would not consume memory since this is a long running process.

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• Split a string by spaces -- preserving quoted substrings -- in Python

  - by Adam Pierce

  I have a string which is like this: this is "a test" I'm trying to write something in Python to split it up by space while ignoring spaces within quotes. The result I'm looking for is: ['this','is','a test'] PS. I know you are going to ask "what happens if there are quotes within the quotes, well, in my application, that will never happen.

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• Python + PyQt program freezes

  - by DSblizzard

  I wrote PyQt application. After it's start I close it (GUI), but timer don't stops and Python sometimes freezes. Only thing to unfreeze it - Ctrl-C, after which following message appears: Traceback (most recent call last): File "", line 262, in timerEvent KeyboardInterrupt timer don't stops again, and CPython works very slowly. How to avoid this problem?

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• exec: 23: python: not found error?

  - by user364133

  im trying to build android from source on ubuntu 10.04. when i enter the repo command: repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair it get this error back exec: 23: python: not found any ideas.

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• How to make a simple clipboard monitor in python

  - by envy

  Hi! I was wondering how to make a simple Clipboard Monitor in python, for GUI I'm using PyGTK. I found gtk.clipboard class and all that but I couldn't find any solution to get the "signals" to trigger the event when the clipboard content has changed :( Any ideas? Thanks you! :)

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• Exception handling with simplexmlrpcserver - python.

  - by silverado

  Hello, Is there any way to handle connection errors with simplexmlrpcserver module? I want to catch any errors within my xmlrpc server to handle them in my own way instead of printing the traceback to stdout.

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• Writing a file shredder in python or ruby?

  - by pmilb21

  In the effort to learn python and/or ruby, I was wondering how a file shredder would be implemented? I would like it to take in a file as an argument and then employ an algorithm to make that file unrecoverable. Would possibly add the support for multiple files or even whole directories later.

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• Parsing timestamp with retarded Python

  - by jellybean

  I want to parse a timestamp from a log file that has been written via datetime.datetime.now().strftime('%Y%m%d%H%M%S') and then compute the number of seconds that have passed since this timestamp. I know I could do it with datetime.datetime.strptime to get back a datetime object and then compute a timedelta. Problem is, the strptime function has been introduced with Python 2.5 and I'm using Python2.4.4 (an upgrade is not possible in my context). Any easy way to do this?

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• Automatically execute commands on launching python shell.

  - by thepandaatemyface

  Hi, I was wondering if there is a way to automatically run commands on entering the python shell as you would with the .bash_profile or .profile scripts with bash. I would like to automatically import some modules so I don't have to type the whole shebang everytime I hop into the shell. Thanks,

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• Python - How is this snippet working?

  - by orokusaki

  For some reason this function confused me: def protocol(port): return port == "443" and "https://" or "http://" Can somebody explain the order of what's happening behind the scenes to make this work the way it does. I understood it as this until I tried it: Either A) def protocol(port): if port == "443": if bool("https://"): return True elif bool("http://"): return True return False Or B) def protocol(port): if port == "443": return True + "https://" else: return True + "http://" Is this some sort of special case in Python, or am I completely misunderstanding how statements work?

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• converting python list of strings to their type

  - by user248237

  given a list of python strings, how can I automatically convert them to their correct type? Meaning, if I have: ["hello", "3", "3.64", "-1"] I'd like this to be converted to the list ["hello", 3, 3.64, -1] where the first element is a stirng, the second an int, the third a float and the fourth an int. how can I do this? thanks.

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• How to create temporary files in memory visible for other process, using python

  - by LazyMiha

  Hello! I`m trying to write simple batch file generator in python. Batch file consist of about 30-50 lines of text and is passed to other applications. During the execution of script there a lot of calls to external applications. I want to create file in memory (like named pipes in win32). Is there any platform independ way? p.s. sorry for possible mistakes in text, I'm still learning English

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• Safest python code running

  - by Oduvan

  How can I protect my web server, if I run custom users code on server. If any user can submit his python source on my server and run it. Maybe some modules or linux tools for close any network and hardware activity for this script. Thank's all for help!

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• Python basics: One "empty" line in Python (print ''). What does it do?

  - by brilliant

  I know this question may well be the silliest question you've herd today, but to me it is a big question at this stage of my programming learning. Why is the second empty line needed in this Python code? What does that line do? print 'Content-Type: text/plain' print '' print 'Hello, world!'

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• Emacs bulk indent for Python

  - by Vernon

  Working with Python in Emacs if I want to add a try/catch to a block of code, I often find that I am having to indent the whole block, line by line. In Emacs, how do you indent the whole block at once. I am not an experienced Emacs user, but just find it is the best tool for working through ssh. I am using Emacs on the command line(Ubuntu), not as a gui, if that makes any difference.

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• Send HTML e-mail in App Engine / Python?

  - by Silver Dragon

  Can you please give me a simple, and straightforward python example of sending an HTML e-mail using App Engine? Plaintext is straightforward, but I'm having difficulties with HTML tags.

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• In python, why is "import *" bad?

  - by Software Enthusiastic

  It is recommended to not to use import * in python. Can anyone please share the reason for that, so that I can avoid it doing next time. Thanks and Regards

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• Are classes in Python in different files?

  - by Asaf

  Much like Java (or php), I'm use to seperating the classes to files. Is it the same deal in Python? plus, how should I name the file? Lowercase like classname.py or the same like ClassName.py? Do I need to do something special if I want to create an object from this class or does the fact that it's in the same "project" (netbeans) makes it ok to create an object from it?

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• Bi-partitle matching in Python

  - by vailen

  Does anybody know any module in Python that computes the best bi-partite matching? I have tried the following two: munkres hungarian However, in my case, I have to deal with non-complete graph (i.e., there might not be an edge between two nodes), and therefore, there might not be a match if the node has no edge. The above two packages seem not be able to deal with this. Any advise?

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• Python style: if statements vs. boolean evaluation

  - by mkscrg

  One of the ideas of Python's design philosophy is "There should be one ... obvious way to do it." (PEP 20), but that can't always be true. I'm specifically referring to (simple) if statements versus boolean evaluation. Consider the following: if words: self.words = words else: self.words = {} versus self.words = words or {} With such a simple situation, which is preferable, stylistically speaking? With more complicated situations one would choose the if statement for readability, right?

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