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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> The system default shell is what I had in mind when filing this issue
> (i.e. what Popen() uses by default or, in the case of Android, what
> Popen() should use).

Well, the question then becomes whether Popen() shouldn't use the user's
default shell instead? :)
It probably doesn't make much of a difference in most cases, though.
Also, there's the problem that some special users may have a void shell
entry (or /bin/false or /sbin/nologin), to prevent a human from logging
in as them.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16353>
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