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

[Chris Jerdonek]

Chris Jerdonek added the comment:

> Also, what reason to get shell name from COMSPEC? What should we do if COMSPEC points to some another shell, not cmd.exe?

FWIW, the subprocess module does this (with surrounding code linked after):

comspec = os.environ.get("COMSPEC", "cmd.exe")

http://hg.python.org/cpython/file/ed091424f230/Lib/subprocess.py#l1060

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