[issue19475] Add timespec optional flag to datetime isoformat() to choose the precision

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

> The problem here is that millisecond and nanosecond seems not to be attributes of the datetime object.

millisecond = dt.microsecond // 1000

nanosecond = 0  # until we add it to datetime.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19475>
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