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

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Nick's library is awesome and I +1 to include it into stdlib if Nick is ready to do.

But also I like to prevent obviously bad usage of popen.
We cannot and don't want to remove popen shell=True param, so let's add raising exception for useless parameters combination.

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nosy: +ncoghlan

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<http://bugs.python.org/issue7839>
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