1 s = 'abcde'
2 i = -1
3 for i in range(-1, -len(s), -1):
4     print s[:i]
5     
6 for i in [None] + range(-1, -len(s), -1):
7     print s[:i]

用[None]想加可以得到想要的结果,即能够获取全部字符串

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