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• How to open a file in the parent directory in python in AppEngine?

  - by GeekTantra

  How to open a file in the parent directory in python in AppEngine? I have a python file module/mod.py with the following code f = open('../data.yml') z = yaml.load(f) f.close() data.yml is in the parent dir of module. The error I get is IOError: [Errno 13] file not accessible: '../data.yml' I am using AppEngine SDK 1.3.3. Is there a work around for this?

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• In what situation should the built-in 'operator' module be used in python?

  - by apphacker

  I'm speaking of this module: http://docs.python.org/library/operator.html From the article: The operator module exports a set of functions implemented in C corresponding to the intrinsic operators of Python. For example, operator.add(x, y) is equivalent to the expression x+y. The function names are those used for special class methods; variants without leading and trailing __ are also provided for convenience. I'm not sure I understand the benefit or purpose of this module.

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• Am I right in thinking there is no way to put an if statement and an else statement on line in Python?

  - by Louise

  Am I right in thinking I can't put an if-statement and the corresponding else-statement on one line in Python? NB: variable = value1 if condition else value2 is NOT two statements. It's one statement which can take the value of one of two expressions. I want to do something like if condition a=value else b=value Am I right in thinking this requires a full if-else in Python? Like if condition: a=value else: b=value Thanks, Louise

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• How does Python differentiate between the different data types?

  - by wrongusername

  Sorry if this is quite noobish to you, but I'm just starting out to learn Python after learning C++ & Java, and I am wondering how in the world I could just declare variables like id = 0 and name = 'John' without any int's or string's in front! I figured out that perhaps it's because there are no ''s in a number, but how would Python figure that out in something like def increase(first, second) instead of something like int increase(int first, int second) in C++?!

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• Using Python as a CGI script without the CGI module?

  - by kilometer

  Is it possible to use Python as CGI without using the CGI module and still get access to all of the browser information and everything? I tried: #!/usr/bin/python import sys print "Content-type: text/html" print data = sys.stdin.readlines() print len(data) but it always prints 0.

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• In Python, how do I create a string of n characters in one line of code?

  - by Thierry Lam

  I need to generate a string with n characters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters: string_val = 'abcdefghij'

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• How to replicate tee behavior in python when using subprocess?

  - by Sorin Sbarnea

  I'm looking for a Python solution that will allow me to save the output of a command in a file without hiding it from the console. Requirements Python solution (not calling tee, it is not available under Windows) to work when calling external programs (subprocess) to work for both stderr and stdout

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• Is there any way to run Python on Android ?

  - by e-satis

  I like the Android platform. Actually, with some friends, we even participate to the ADC with the Spoxt project. But Java is not my favourite language at all. We are working on a S60 version and this platform has a nice Python API. Of course there is nothing official about Python on Android, but since Jython exists, does anybody know a way to let the snake and the robot work together ?

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• how to download file then run it with hide mode! in python

  - by Str1k3r

  hello i was searching about how to download file then run it ! such as in perl #!/usr/bin/perl -w use LWP::Simple; getstore('http://example.com/file.bat', 'sfile.bat'); system('file.bat'); ummmm so can i made like that in python ? umm i guess we have to use urllib and os in python ? or what :S

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• Is it guaranteed that False == 0 and True == 1 in Python?

  - by EOL

  Is it guaranteed that False == 0 and True == 1, in Python? For instance, is it in any way guaranteed that the following code will always produce the same results, whatever the version of Python (existing and in the foreseeable future)? 0 == False # True 1 == True # True ['zero', 'one'][False] # is 'zero' Any reference to the official documentation would be much appreciated! Other comments would be appreciated too… :)

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• Python or Ruby is better for web development? [closed]

  - by Tattat

  I know that Ruby on rails is very famous on Web Application Development, and python have a powerful library. Which language do you think for a totally brand new web project? Ruby or Python is a gd start? Also, you can share your development experience in both language. thz u.

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• Python: What is the hard recursion limit for Linux, Mac and Windows?

  - by cool-RR

  Python's sys module provides a function setrecursionlimit that lets you change Python's maximum recursion limit. The docs say: The highest possible limit is platform-dependent. My question is: What is the highest possible limits for various platforms, under CPython? I would like to know the values for Linux, Mac and Windows.

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• How do you redirect a standard stream of a C++ routine wrapped with SWIG and exposed to Python?

  - by cmdev

  Is it possible to control the standard streams of C++ code in python? The code is wrapped with SWIG and then exposed to Python where I call one of its functions. I am getting all kinds of unwanted messages coming from C++ code and I want to suppress them either by not using the output stream or by redirecting it to a bit bucket, e.g. devnull from the os module.

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• Why can't I access the instance.__class__ attribute in Python?

  - by froadie

  I'm new to Python, and I know I must be missing something pretty simple, but why doesn't this very, very simple code work? class myClass: pass testObject = myClass print testObject.__class__ I get the following error: AttributeError: class myClass has no attribute '__class__' Doesn't every object in Python have a __class__ attribute?

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• Can Python's set absence of ordering be considered random order?

  - by Chuim

  Hello people. I'd like to know if the absence of element ordering of the Python's built-in set structure is "random enough". For instance, taking the iterator of a set, can it be considered a shuffled view of its elements? (If it matters, I'm running Python 2.6.5 on a Windows host.)

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• What's the scope of a Python variable declared in an if statement?

  - by froadie

  I'm new to Python, so this is probably a simple scoping question. The following code in a Python file (module) is confusing me slightly: if __name__ == '__main__': x = 1 print x In other languages I've worked in, this code would throw an exception, as the x variable is local to the if statement and should not exist outside of it. But this code executes, and prints 1. Can anyone explain this behavior? Are all variables declared in a module global/available to the entire module?

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• efficiently finding the interval with non-zeros in scipy/numpy in Python?

  - by user248237

  suppose I have a python list or a python 1-d array (represented in numpy). assume that there is a contiguous stretch of elements how can I find the start and end coordinates (i.e. indices) of the stretch of non-zeros in this list or array? for example, a = [0, 0, 0, 0, 1, 2, 3, 4] nonzero_coords(a) should return [4, 7]. for: b = [1, 2, 3, 4, 0, 0] nonzero_coords(b) should return [0, 2]. thanks.

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• Implement a server that receives and processes client request(cassandra as backend), Python or C++?

  - by Mickey Shine

  I am planning to build an inverted index searching system with cassandra as its storage backend. But I need some guidances to build a highly efficient searching daemon server. I know a web server written in Python called tornado, my questions are: Is Python a good choice for developing such kind of app? Is Nginx(or Sphinx) a good example that I can look inside to learn its architecture to implement a highly efficient server? Anything else I should learn to do this? Thank you~

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• Python's standard library - is there a module for balanced binary tree?

  - by aeter

  Is there a module for AVL or Red-Black or some other type of a balanced binary tree in the standard library of Python? I have tried to find one, but unsuccessfully (I'm relatively new to Python).

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• What application you recommend to start peeking to learn Python style?

  - by voyager

  Do you know any application, the more interesting/useful the better, to introduce a new person to Python language and the Python code style, but not necessarily to OO programing, so as to learn the subtleties and idioms of the language and surrounding community? I'm thinking along the lines of people that has worked with JavaScript, Java or .NET, and already have a strong hold of OO concepts.

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• Maximal Length of List to Shuffle with Python random.shuffle?

  - by Henrik

  I have a list which I shuffle with the Python built in shuffle function (random.shuffle) However, the Python reference states: Note that for even rather small len(x), the total number of permutations of x is larger than the period of most random number generators; this implies that most permutations of a long sequence can never be generated. Now, I wonder what this "rather small len(x)" means. 100, 1000, 10000,... Can anybody clarify? Thanks!

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• how to do bitwise exclusive or of two strings in python?

  - by mekasperasky

  i would like to do bitwise exclusive or of words in python but xor of strings are not allowed in python . so how to do it ?

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• Can Python's set absesnce of ordering be considered random order?

  - by Chuim

  Hello people. I'd like to know if the absence of element ordering of the Python's built-in set structure is "random enough". For instance, taking the iterator of a set, can it be considered a shuffled view of its elements? (If it matters, I'm running Python 2.6.5 on a Windows host.)

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• How to send file from C# to apache with mod_wsgi and python?

  - by SuitUp

  How to send file from C# to apache with mod_wsgi and python? It will be nice to see code example in both c# (client) and python (server).

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• How to send file from C# to apache with mod_wsgi (django) and python?

  - by SuitUp

  How to send file from C# to apache with mod_wsgi (django) and python? It will be nice to see code example in both c# (client) and python (server).

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