knifenomad wrote:
> i know it's not very hard to get that solution.
> just by implementing simple function like below.
>
> def partition(target, predicate):
> """
> split a list into two partitions with a predicate
> provided.
> any better ideas? :)
> """
> true = []
> false= []
> for item in target:
> if predicates(item):
> true.append(item)
> else:
> false.append(item)
> return true, false
>
> but i wonder if there's another way to do this with standard libraries
> or .. built-ins.
> if it's not, i'd like the list objects to have partition method
I've oft collected partitions in a dict, so I'll suggest the
generalization:
def partition(target, predicate):
result = {}
for item in target:
result.setdefault(predicate(item), []).append(item)
return result
> true, false = [1,2,3,4].partition(lambda x: x >1)
>
> print true, false
> [2,3,4] [1]
With my version you'd get:
{False: [1], True: [2, 3, 4]}
--
--Bryan
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