[Python-ideas] [Python-Dev] datetime module enhancements

[Christian Heimes]

Collin Winter wrote:
> It might be neat to add a __contains__ method to date() objects so
> that "datetime(2007, 1, 1, 0, 0, 0) in date(2007, 1, 1)" would be
> True. This would seem to fulfill the During operator.

Yeah, I had the same idea:
http://permalink.gmane.org/gmane.comp.python.devel/86828

In my opinion the comparison operations for date and datetime object
should be defined as:

datetime before date: <
-----------------------

>>> datetime(2007, 1, 1, 23, 59, 59) < date(2007, 1, 2)
True
Valid for all datetimes before (smaller than) datetime(2007, 1, 2, 0, 0, 0)

datetime during date: in
------------------------
>>> datetime(2007, 1, 2, 23, 59, 59) in date(2007, 1, 2)
True
Valid for all datetimes((2007, 1, 2, *, *, *).date() == date(2007, 1, 2)

datetime after date: >
----------------------
>>> datetime(2007, 1, 3, 0, 0, 0) in date(2007, 1, 2)
True
Valid for all datetimes after 2007-01-02 (greater or equal 2007-01-03
00:00:00)

datetime <= date and datetime => date should raise a TypeError. The
result is ambiguous. A date with time is never equal to a date.

Christian