[issue20053] venv and ensurepip are affected by default pip config file

[Paul Moore]

Paul Moore added the comment:

As noted in http://bugs.python.org/issue1311 (referenced from http://bugs.python.org/issue20541) it's not actually correct to assume that os.path.exists(os.devnull) returns true, as on Windows the "null device" is not a proper filesystem object.

So I'd suggest that the code here needs to avoid relying on this assumption.

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