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

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

> Actually, nanosecond = dt.microsecond*1000.

I was thinking in terms breaking the fractional part of say

00:00:00.123456789

into

mili = 123
micro = 456
nano = 789

but you are right, a correct analogy for dt.microsecond in this case will be nanosecond=123456789 or 123456000 until we start storing enough precision.

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