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

[Guido van Rossum]

Guido van Rossum added the comment:

I like the idea. I have one suggestion: can we add 'milliseconds' as an option too? And might a well add 'nanoseconds' too, for future-proofing. I suppose there isn't a real use case for 'hours' but it seems silly to  leave it out. I expect that 'minutes' will be the most popular option, since HH:MM is the precision that most people care about for meetings and stuff.

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