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基础不好，纠结了半天才写出来

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大炳子1995

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

L2=[a.lower() for a in L1 if isinstance(a,str) is true]

大炳子1995

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

T要大写，当然is True写不写都无所谓，只要isinstance判定正确就整个都能运作。

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