看看这个:

>>> # Note this is for Python 2.x.
>>> def func(lst):
...     return map(range, xrange(len(lst)+1))
...
>>> L = range(5)
>>> func(L)
[[], [0], [0, 1], [0, 1, 2], [0, 1, 2, 3], [0, 1, 2, 3, 4]]
>>>