[issue37330] open(): remove 'U' mode, deprecated since Python 3.3

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Thanks for the review Serhiy ;-)

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37330>
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