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

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

> I don't really think nanoseconds belong here.

What about milliseconds?  I'll leave it for Guido to make a call on nanoseconds.  My vote is +0.5.

> If they don't
> exist anywhere else in the module, why should they be suddenly 
> introduced here?

The timespec feature is modeled after GNU date --iso-8601[=timespec] option which does support nanoseconds.  It is fairly common to support nanoseconds these days and it does not cost much to implement.

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