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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I think the functionality of getting either the system-wide default shell or the current user's default shell can be useful regardless of whether the specific subprocess issue was fixed.

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nosy: +ncoghlan
stage: patch review -> needs patch
versions: +Python 3.8 -Python 3.5

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