[issue16353] add function to os module for getting path to default shell

[Chris Jerdonek]

Chris Jerdonek added the comment:

> Well, the question then becomes whether Popen() shouldn't use the user's default shell instead? :)

That's a good question, too. :)  I was thinking just in terms of supporting the status quo.  Maybe two functions would be useful? (as suggested also by Andrew)

I do think the question of changing Popen()'s behavior should be decided independently of this issue though.  In other words, even if we change Popen() in the future, I think exposing the system default shell would still be worthwhile.

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<http://bugs.python.org/issue16353>
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