s = 'abcdefgh'
s[::-1] #翻转操作
s[::2] #隔一个取一个
s = 'abcde'
i = -1
for i in range(-1, -len(s), -1):
print s[:i]
s = 'abcde'
for i in [None] + range(-1, -len(s), -1):
print s[:i]
摘自《Python核心编程》
转载于:https://www.cnblogs.com/dflyingfish/p/5049981.html
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