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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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• Command line tool in python in a fixed root directory ...

  - by koleto

  I would like to install my python application as a command line tool that should work entirelly inside the install directory (for example C:\Python26\Lib\site-packages\application) The problem is I would like to reffer in runtime to the submodules and resources from within the application directory three. If I install the app with [console_scripts] option the default path is the current directory. Is there a elegant way to keep the current execution path of the application to the site-packages directory? Thanks

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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 can I find the dimensions of a matrix in Python?

  - by PBD10017

  How can I find the dimensions of a matrix in Python. Len(A) returns only one variable. Edit: Hi Thanks. close = dataobj.get_data(timestamps, symbols, closefield) Is (I assume) generating a matrix of integers (less likely strings). I need to find the size of that matrix, so I can run some tests without having to iterate through all of the elements. As far as the data type goes, I assume it's an array of arrays (or list of lists).

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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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• 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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• Python : How to intercept a method call which does-not exists?

  - by Yugal Jindle

  I want to create a class that doesn't gives an Attribute Error on call of any method that may or may not exists: My class: class magic_class: ... # How to over-ride method calls ... Expected Output: ob = magic_class() ob.unknown_method() # Prints 'unknown_method' was called ob.unknown_method2() # Prints 'unknown_method2' was called Now, unknown_method and unknown_method2 doesn't actually exists in the class, but how can we intercept the method call in python ?

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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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• 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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• 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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• 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 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 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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• With what kind of IDE (if any) you build python GUI projects?

  - by Jon

  Is there any IDE (like VS) with drag and drop support for building python GUI, connecting to dbs etc? Eventhough I am an emacs guy, I find it much easier to create GUI with VS.

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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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• If a python module says its dependent on debhelper and cdbs is there no way to get it to run on a no

  - by Ryan

  I want to try python purple but I don't have debian. Is there a way to get it to run on either windows or a different linux?

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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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• (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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