[issue23332] datetime.isoformat() -> explicitly mark UTC string as such

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Why do you call it a bug?  Specifying UTC as +00:00 is perfectly valid by ISO 8601 and some RFCs that are based on the ISO standard recommend against using the Z code.

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<http://bugs.python.org/issue23332>
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