Oops! Forgot one:
[Guido]
> ... create new timedelta-ish classes that implement "human" arithmetic
Note that there's an annoying inelegance here: after
datetime2 = datetime1 + timedeltaish # or subtraction
then what does:
datetime2 - datetime1
produce? Knowledge of the _kind_ of timedelta-ish object used to
produce datetime2 is long gone, so it may not be the case that
datetime2 - datetime1 == timedeltaish
or even produce an object of the same class as timedeltaish.
Of course that's never a problem today. If the inelegance is thought
to be unbearable, I suppose new timedelta-ish classes could provide an
explicit class method to subtract datetime instances (yielding "the
right" timedelta-ish object of the class).
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