python split and isplit

split.py

def split(pred, array):
    return filter(pred, array), filter(lambda e: not pred(e), array)


import itertools

def isplit(pred, iterable):
    pos, neg = itertools.tee(iterable, 2)
    return itertools.ifilter(pred, pos), itertools.ifilterfalse(pred, neg)

'''
>>> split(lambda e: e == 0, [1,2,0,3,0,4])
([0, 0], [1, 2, 3, 4])

This seems like it may be a generally useful little function; is there a cleaner/better way to do it?
'''