[issue7839] Popen should raise ValueError if pass a string when shell=False or a list when shell=True

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

I realize we're down to the wire, but would it be too late to fix this in 2.7?  It is a genuine bug, and it won't break any correct code.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7839>
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