Vsrc

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Description

Vsrc is a developer tool that finds and displays a module's Python source file by searching the Module Search Path, which means the list of directories given by sys.path, the current directory, PYTHONPATH, and the installation-dependent default path. Therefore, Vsrc can find standard modules (like 'string' and 'os.path'), 3rd-party modules (like pygame), and user-defined modules. Vsrc works from both the command-line and from inside of Python's interactive mode.

Note that not all modules include Python source, for example, 'sys' is a C Built-in. If a .py file for the module is found, it's displayed after first checking the value of the optional environment variable VSRC_VIEWER. If VSRC_VIEWER isn't set, then Vsrc will attempt to use the "less" pager (if it exists in the system PATH), otherwise it uses "more".

The value of VSRC_VIEWER can be any viewer you like, such as a normal text editor like vim or notepad, or a pager program like less or more.

Vsrc is platform-independent.

Changes

Since Vsrc 0.1 (which was created July 16th, 2003) Vsrc has been rewritten as of July 30th, 2009 and includes some changes...

It now uses VSRC_VIEWER as an environment variable, instead of PAGER.

Vsrc will now work in Windows using cmd.exe. The default viewer it uses is less.exe, if you have it in your path, otherwise it uses more.exe (which comes with Windows) but you can also create a VSRC_VIEWER environment variable to use another viewer, such as notepad. You can get less.exe, here. If you get the setup program it will install less.exe into C:\Program Files\GnuWin32\bin. Make sure you add this directory to your Windows %PATH%.

Usage

Command-line:

$ python vsrc.py <module>

Interactive mode:

import vsrc
vsrc.vsrc('<module>')

Examples

To see the "socket" module's corresponding socket.py source file, type:

$ python vsrc.py socket

or from within Python's interactive-mode, type:

>>> import vsrc
>>> vsrc.vsrc('socket')

and vsrc will automatically find socket.py--which, if you use Linux, would 
be something like /usr/lib/python/socket.py-- and load in your viewer.

To seek out and view Pygame's sprite module's source code, type:

$ ./vsrc.py pygame.sprite

or:

>>> from vsrc import vsrc
>>> vsrc('pygame.sprite')

To view a Python source file from the current directory, do:

>>> vsrc('foo')

as long as you have a file called 'foo.py' in the current dir.