[EMAIL PROTECTED] wrote:
>I have a class that has, as an attribute, an instance of
> datetime.datetime(). I would like to be able to compare my class
> directly to instances of datetime.datetime in addition to other
> instances of my class. The value used for the comparison in either
> case should be the value of the datetime attribute of the class:
>
> from datetime import datetime
>
> class GeneralizedTime(object):
> def __init__(self, time=None):
> if time is None:
> self.datetime = datetime.now()
> def __cmp__(self, x):
> if isinstance(x, GeneralizedTime):
> return cmp(self.datetime, x.datetime)
> if isinstance(x, datetime):
> return cmp(self.datetime, x)
>
>>>> import datetime
>>>>
>>>> GeneralizedTime() > datetime.now()
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> TypeError: can't compare datetime.datetime to GeneralizedTime
>
> Clearly I'm misunderstanding something, here. As I understand my code,
> I'm directly comparing an instance of datetime (self.datetime) to
> another instance of datetime.
sure looks like you're comparing a datetime instance against a GeneralizeTime
instance to me.
why not just inherit from datetime instead? or read footnote 4 under "supported
operations" on this page for info on how to implement mixed-type comparisions:
http://docs.python.org/lib/datetime-datetime.html
</F>
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