尝试列表理解：
lst = [[] for _ in xrange(a)]
见下文：
>>> a = 3
>>> lst = [[] for _ in xrange(a)]
>>> lst
[[], [], []]
>>> a = 10
>>> lst = [[] for _ in xrange(a)]
>>> lst
[[], [], [], [], [], [], [], [], [], []]
>>> # This is to prove that each of the lists in lst is unique
>>> lst[0].append(1)
>>> lst
[[1], [], [], [], [], [], [], [], [], []]
>>>
但是请注意，以上内容适用于Python2.x。在Python 3.x.上，由于xrange已被删除，因此您需要：
lst = [[] for _ in range(a)]
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