[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:

What's about test which pass bytes to Popen?
Should it be deprecated and should Popen accept only unicode strings only — I mean `str` type?
As I know the trend of py3k to get rid of bytes in filesystem names.

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