[3.9] bpo-14156: Make argparse.FileType work correctly for binary fil… #31979
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…e modes when argument is '-' (GH-13165)
Also made modes containing 'a' or 'x' act the same as a mode containing 'w' when argument is '-'
(so 'a'/'x' return sys.stdout like 'w', and 'ab'/'xb' return sys.stdout.buffer like 'wb')..
(cherry picked from commit eafec26)
Co-authored-by: MojoVampire [email protected]
https://bugs.python.org/issue14156