[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:

Zsolt: an excellent idea!  That shouldn't change the semantics of the function, and therefore is strictly a bug fix.  Which means we could potentially backport it, yes?

Obviously we only need to change it between string / list if we're going to have this problem, and that only happens when there are parameters.  So the change could be very narrow in scope.  Lovely!

R. David: Why did you remove Python 2.7 from the list?  We see the behavior there too.

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