For closure, I've added a package, timeliterals

(env) [pgdr@hostname ~]$ pip install timeliterals
(env) [pgdr@hostname ~]$ python
>>> from timeliterals import *
>>> 3*hours
datetime.timedelta(0, 10800)
>>> 3*minutes
datetime.timedelta(0, 180)
>>> 3*seconds
datetime.timedelta(0, 3)

The source code is at https://github.com/pgdr/timeliterals

I'm not going to submit a patch to datetime at this time, but I will if people
would be interested.

- Pål