[issue37549] os.dup() fails for standard streams on Windows 7

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Oh, os.dup() doc says: "On Windows, when duplicating a standard stream (0: stdin, 1: stdout, 2: stderr), the new file descriptor is inheritable."
https://docs.python.org/dev/library/os.html

Maybe we should add an inheritable paramater to os.dup() in Python 3.8?

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