def subs(l): if l == []: return [[]] x = subs(l[1:]) return x + [[l[0]] + y for y in x]
结果：
>>> print (subs([1, 2, 3]))[[], [3], [2], [2, 3], [1], [1, 3], [1, 2], [1, 2, 3]]
def subs(l): if l == []: return [[]] x = subs(l[1:]) return x + [[l[0]] + y for y in x]
结果：
>>> print (subs([1, 2, 3]))[[], [3], [2], [2, 3], [1], [1, 3], [1, 2], [1, 2, 3]]
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