Paul Ganssle <[email protected]> added the comment:
An alternate possibility here might be to implement either `__round__` or a
`round` function in `datetime` (which would basically automatically add this
precision functionality to *all* the constructors, not just now). An example
implementation:
from datetime import datetime
class Datetime(datetime):
def __round__(self, ndigits=None):
if ndigits is None:
return self
dflt_args = {
'month': 1,
'day': 1,
'hour': 0,
'minute': 0,
'second': 0,
'microsecond': 0
}
args = list(dflt_args.keys())
if ndigits not in dflt_args:
raise ValueError('Unknown rounding component: %s' % ndigits)
idx = args.index(ndigits)
return self.replace(**{arg: dflt_args[arg] for arg in args[idx:]})
It's not great that `__round__`'s argument is `ndigits`, though. If we don't
want to just add a `round` method to `datetime`, another option might be to
implement `__mod__` somehow, so you could do `datetime.now() %
timedelta(seconds=1)`, but that seems complicated (and also doesn't let you
round to the nearest month).
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Python tracker <[email protected]>
<https://bugs.python.org/issue32522>
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