[3.10] bpo-14156: Make argparse.FileType work correctly for binary file modes when argument is '-' (GH-13165) #31706
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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 shadowranger+github@gmail.com
https://bugs.python.org/issue14156