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

[Guido van Rossum]

Guido van Rossum added the comment:

Except for the case where you're closer than half a usec from the next value, IMO rounding makes no sense when suppressing digits. I most definitely would never want 9:59:59 to be rounded to 10:00 when suppressing seconds. If you really think there are use cases for that you could add a 'round=True' flag (as long as it defaults to False). That seems better than supporting rounding on datetime objects themselves. But I think you're just speculating.

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<http://bugs.python.org/issue19475>
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