不能退出循环块
>>> for x in [1,2,3,4,5,6,7,8,9]:
... for y in [0,1,2,3,4,5,6,7,8,9]:
... if x < y:
...
File "<stdin>", line 4
^
IndentationError: expected an indented block
>>>
要退出循环块,输入print 时报错
>>> for x in [1,2,3,4,5,6,7,8,9]:
... for y in [0,1,2,3,4,5,6,7,8,9]:
... if x < y:
...
File "<stdin>", line 4
^
IndentationError: expected an indented block
>>>
要退出循环块,输入print 时报错
2017-08-17
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