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作业的问题。。

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aftersomanyyears

#1 Created at ... [Delete] [Delete and Lock User] 
>>> L2 = [bb.lower() for bb in L1 if isinstance(bb,str)]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in <listcomp>
TypeError: isinstance() arg 2 must be a type or tuple of types

请教下为什么会这样呢。。

aftersomanyyears

#2 Created at ... [Delete] [Delete and Lock User]

好吧，是因为，我自己不小心把str给赋值了！

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