当然有可能，您只需要使用list的子类即可。
class GrowingList(list):
def __setitem__(self, index, value):
if index >= len(self):
self.extend([None]*(index + 1 - len(self)))
list.__setitem__(self, index, value)
用法：
>>> grow = GrowingList()
>>> grow[10] = 4
>>> len(grow)
11
>>> grow
[None, None, None, None, None, None, None, None, None, None, 4]
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