Andy Buckley <a...@insectnation.org> added the comment:

Personally I think it's a very useful feature: the purpose for running which 
may not be to get the full path to the executable and then run it, but rather 
that that path prefix is important for something else. I'm sure when I joined 
this issue I had some need like that -- after all, as you say, if you just want 
to run it then there are better ways.

In general, once users have a need (for whatever reason) to start firing off 
subprocesses from their Python scripts, things can get ugly. Providing a 
portable path search function provides a way to keep one kind of that ugliness 
inside Python for the cases where it really is needed. As for abuse... well, 
people will always find a way to abuse bits of the library: I think that's an 
issue for them, rather than a reason to block this functionality ;)

My $0.02,
Andy

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<http://bugs.python.org/issue444582>
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