gistfile1.py

import itertools
#ugly one-liner
def _ugly_split_at(pred, seq):
        return list(itertools.ifilter(
            None,
            [
                (
                    (seq[idx:idx+1] + list(itertools.takewhile(lambda x: not pred(x), seq[idx+1:])))
                    if idx == 0 or pred(el)
                    else []
                )
                for idx, el in enumerate(seq)
            ]
        ))

#iterable version
def _spliterator(pred, iterable):
    iterable = iter(iterable)
    try:
        sublist = [iterable.next()]
    except StopIteration:
        return
    for el in iterable:
        if pred(el):
            yield sublist
            sublist = [el]
        else:
            sublist.append(el)
    yield sublist

def test_split_methods():
    pred = lambda x: len(x) == 1
    l = ['foo', 'bar', 'a', 'baz', 'b', 'c', 'spam']
    print _ugly_split_at(pred, l)
    print _ugly_split_at(pred, [])
    print list(_spliterator(pred, l))
    print list(_spliterator(pred, (x for x in l))) #works with iterables
    print list(_spliterator(pred, []))

if __name__ == '__main__':
    test_split_methods()