在此插入代码
L1 = ['Hello', 'World', 18, 'Apple', None] L2=[s.lower() for s in L1 if isinstance(s,str)] print (L2)
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fressman
L1 = ['Hello', 'World', 18, 'Apple', None] L2=[s.lower() for s in L1 if isinstance(s,str)] print (L2)