A classify of my own

classify.txt

>>> oddness = lambda n: n % 2
>>> oddness(0)
0
>>> oddness(3)
1
>>> def classify(things, func):
...     result = {}
...     for t in things:
...         if func(t) in result:
...             result[func(t)].append(t)
...         else:
...             result[func(t)] = [t]
...     return result
... 
>>> classify([1,2,3,4,5,6,7,8,9], oddness)
{0: [2, 4, 6, 8], 1: [1, 3, 5, 7, 9]}
>>>