see http://starship.python.net/~tmick/#which

The author agrees with me in his README.

Even better: include which as a module in the standard 
library so it can be used programmatically and as::

  python -m which ...

or maybe::

  python -m os.which ...

cheers

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The URL is now bad... Do you have a current location of the
file?

In any case, we cannot really replace it unless Trent
actively contributes it. So you have to pursudate Trent to
contribute it first.

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Current location: http://trentm.com/projects/which/

About getting Trent to actively contribute, I'll cite the 
linked page:

  "I also would be happy to have this be a replacement for 
the which.py in the Python CVS tree at dist/src/Tools/
scripts/which.py which is Unix-specific and not usable as a 
module; and perhaps for inclusion in the stdlib."

So I do not think this will be a problem.
(No way of cc:ing someone for sf.net replies? I will try 
contacting him directly, cc:ing you.)

cheers

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Can you please work with Trent on contributing it? Determine
whether it should be targeted for the standard library or
for Tools/scripts; if for the standard library, somebody
needs to provide documentation and test cases also (and
there should be an API review by potential users).

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I'm happy to contribute this to the Python core. There are
some TODOs here that I think should be worked through:

http://trentm.com/projects/which/TODO.txt

I'll see if wrstlprmpft and I can get through those. Help
and opinions from others very welcome.

I think Tools/scripts/which.py is obsoleted by the upcoming shutil.which function.