Alexander Belopolsky added the comment:
I hope my prediction "I am afraid that the rounding issues may kill this
proposal" (see msg202276) will not come true.
I think the correct way to view "timespec" is a way to suppress/enforce
printing of trailing digits.
Users that choose printing less than full usec format should make sure that
their datetime instances are properly rounded before printing.
Unfortunately, I does not look like the datetime module makes rounding easy.
The best I can think of is something like
def round_datetime(dt, delta):
dt0 = datetime.combine(dt.date(), time(0))
return dt0 + round((dt - dt0) / delta) * delta
Maybe a datetime.round() method along these lines will be a worthwhile addition?
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