datetime and the rich-companison operators

Chris Rebert clp at
Mon Dec 8 18:52:49 CET 2008

On Sun, Dec 7, 2008 at 11:41 PM, Ethan Furman <ethan at> wrote:
> Greetings All!
> I am implementing a NullDate class in order to mirror dates and datetimes
> that have no value  (yes, this is for my dbf  module :)
> I'm still a bit fuzzy about class methods, hashing, and __new__, but my
> question of the moment is this:  it seems to me that with two dates or
> datetimes, they should either be equal, or one should precede the other, and
> this can be accomplished quite handily with __cmp__... so does anyone know
> why the rich comparisons were used in the datetime module? Was it simply a
> style choice, or is something being handled that __cmp__ couldn't cope with?

Probably because __cmp__ was removed in Python 3.0, thus requiring the
use of the rich comparison methods in its place.
See the earlier thread entitled "Python 3 __cmp__ semantic change?".


Follow the path of the Iguana...

> Thanks in advance!
> ~ethan~
> --

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