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• What is the purpose of subclassing the class "object" in Python?

  - by ignoramus

  All the Python built-ins are subclasses of object and I come across many user-defined classes which are too. Why? What is the purpose of the class object? It's just an empty class, right?

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• Python ORM that auto-generates/updates tables and uses SQLite?

  - by Jason Miesionczek

  I am doing some prototyping for a new desktop app i am writing in Python, and i want to use SQLite and an ORM to store data. My question is, are there any ORM libraries that support auto-generating/updating the database schema and work with SQLite?

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• How do I iterate over all lines of files passed on the commandline in Python?

  - by Tg

  I usually do this in Perl: whatever.pl while(<>) { #do whatever; } then cat foo.txt | whatever.pl Now, I want to do this in Python. I tried sys.stdin but I have no idea how to do as I have done in Perl. How can I read the input? Thanks. EDIT: Thanks, I like every single solution.

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• how to make a python or perl script portable to both linux and windows?

  - by Tim

  I was wondering how to make a python script portable to both linux and windows? One problem I see is shebang. How to write the shebang so that the script can be run on both windows and linux? Are there other problems besides shebang that I should know? Is the solution same for perl script? Thanks and regards!

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• Is there an image phase correlation library available for Python?

  - by kamasudra

  A project that involves image processing, i.e. to calculate the angular shift of the same image when shifted by a medium of certain Refractive Index. We have to build an app that correlates the 2 images (phase/2D correlation?) and then plot using Chaco and Mayavi (2 libraries in Python). Is there any other existing template software (FOSS) that we can base our app on, or use it as a reference?

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• taking a character input in python from a file?

  - by mekasperasky

  in python , suppose i have file data.txt . which has 6 lines of data . I want to calculate the no of lines which i am planning to do by going through each character and finding out the number of '\n' in the file . How to take one character input from the file ? Readline taken the whole line .

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• Search backward through a string using a regex (in Python)?

  - by John Mulder

  I'm parsing some code and want to match the doxygen comments before a function. However, because I want to match for a specific function name, getting only the immediately previous comment is giving me problems. Is there a way to search backward through a string using the Python Regex library? Is there a better (easier) approach that I'm missing?

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• What does a b prefix before a python string means ?

  - by kriss

  In a python source code I stumbled upon I've seen a small b before a string like in: b"abcdef" I know of u prefix that means unicode and r prefix that means raw. What does the b stand for and in which kind of source code is it useful as it seems to be exactly like a plain string without any prefix ?

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• How do I convert a unicode to a string at the Python level?

  - by Thierry Lam

  The following unicode and string can exist on their own if defined explicitly: >>> value_str='Andr\xc3\xa9' >>> value_uni=u'Andr\xc3\xa9' If I only have u'Andr\xc3\xa9' assigned to a variable like above, how do I convert it to 'Andr\xc3\xa9' in Python 2.5 or 2.6?

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• Is there Perl's YAPE::Regex::Explain alternative to python?

  - by S.Mark

  Is there Perl's YAPE::Regex::Explain alternative to python? For example, which could do following regex \w+=\d+|\w+='[^']+' to explanations like this NODE EXPLANATION -------------------------------------------------------------------------------- \w+ word characters (a-z, A-Z, 0-9, _) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- \d+ digits (0-9) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- | OR -------------------------------------------------------------------------------- \w+ word characters (a-z, A-Z, 0-9, _) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- =' '=\'' -------------------------------------------------------------------------------- [^']+ any character except: ''' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ' '\''

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• Exercise 7.9 in "How to Think Like a Computer Scientist (python)" measuring occurrences of a character in a string

  - by Abie

  The question is how to write a program that measures how many times a character appears in a string in a generalizable way in python. The code that I wrote: def countLetters(str, ch): count=0 index=0 for ch in str: if ch==str[index]: count=count+1 index=index+1 print count when I use this function, it measures the length of the string instead of how many times the character occurs in the string. What did I do wrong? What is the right way to write this code?

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• How do I simulate a progress counter in a command line application in Python?

  - by CRP

  My Python program does a series of things and prints some diagnostic output. I would also like to have a progress counter like this: Percentage done: 25% where the number increases "in place". If I use only string statements I can write separate numbers, but that would clutter the screen. Is there some way to achieve this, for example using some escape char for backspace in order to clear a number and write the next one? Thanks

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• What is the best library in python to use to interface with a SQL database?

  - by Seth

  I am currently processing text/html data and I wish to store my results in some sort of database. My current setup is Pydev with Eclipse. What is the best database to use with my current development environment? What is the best library in python to use to interface with suggested database?

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• Bypassing import in Python so that I don't have to upload multiple libraries and classes?

  - by Rob

  For example, I have a few python scripts, that link together and some libraries for it that need to be imported. I'm trying to reduce it to only one script. So instead of: import library.py Can I just take the coding from library.py and put into the main script?

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• which is better ? Python or C++?

  - by drfacundo

  Hi boys, im newest... I've got a simple question... wich is better? Python or C++? I wanna study computational science, and i like algorithms and TAD analyses... what do you prefer?

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• python on the web, does it compile down to bytecode or is it more like php?

  - by Blankman

  Does python compile down to some byte code or is it rendered on the fly each time like php/asp? From my readings I read it has its own byte code format, so i figured it was like java/.net where it compiles into a intermediate language/byte code. so it is more effecient in that respect that php right?

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• (Python/Django): How do I keep my production db in sync (scheme and data) and with dev pc db?

  - by Emilio

  Hello, newbie here. i have a local Postgre database which will be filled with data (daily) on my local development machine. What is a good solution to transfer/sync/mirror this data to a production postgre database. For what it's worth I'm developing in Python using Dajngo. Thanks!

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• Is PHP enough to be a great developer or do you have to learn Rails/Python?

  - by Imran

  My question really is can you do EVERYTHING in PHP that you can do in (Ruby)Rails/Django(python)? By me just concentrating on PHP (Framworks too) will i be losing out in someway? I prefer PHP but everyone tells me Rails is better? Any advice? Thank you in advance ;-)

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• Printing Variable names and contents as debugging tool; looking for emacs/Python shortcut

  - by Schof

  I find myself adding debugging "print" statements quite often -- stuff like this: print("a_variable_name: %s" % a_variable_name) How do you all do that? Am I being neurotic in trying to find a way to optimize this? I may be working on a function and put in a half-dozen or so of those lines, figure out why it's not working, and then cut them out again. Have you developed an efficient way of doing that? I'm coding Python in Emacs.

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• What is the best Database and Python Library to use with Pydev and Eclipse?

  - by Seth

  I am currently processing text/html data and I wish to store my results in some sort of database. My current setup is Pydev with Eclipse. What is the best database to use with my current development environment? What is the best python library to use with the suggested database?

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• Making a python script run at a set rate.

  - by Matt1024

  How can I make a python loop run at a set rate regardless of how long it takes to execute commands in the loop (providing the commands take less time to run than the loop is allowed)? How can I make this run every 0.25 seconds, for example? while True: print("OK")

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• How to make a simple cross-platform webbrowser with Python?

  - by luc

  The http://code.google.com/p/pywebkitgtk/ looks great but it seems to be running on linux only. Does anybody know if there is something similar but cross-platform? If not what can be the alternatives to make with Python a simple web-browser that can run on Windows, MAC os and linux? Thanks in advance

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• how to pass a command line argument to a c++ file through a python code?

  - by mekasperasky

  i am compiling a c++ file in python code using this os.system("rc.cpp") and then os.system("./a.out") . I would like to pass a command line argument to the rc file . how do i do it?

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• How to find the real user home directory using python?

  - by nsharish

  I see that if we change the HOME(linux) or USERPROFILE(windows) environmental variable and run a python script, it returns the new value as the user home when I tried, os.environ['HOME'] os.exp Is there any way to find the real user home directory without relying on the environmental variable?. Thanx.

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• How to see Microsoft Speech Recognition language and if it's active using Python?

  - by aF

  Hello, I'm using windows 7 english and I want to know how to see the microsoft speech language and to see if the speech recognition is active. How can I do it using python?

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