L1=['Hello','World',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)] print(L2)
总结：直接用isinstance判断即可
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你在眉梢
-- coding: utf-8 --
L1=['Hello','World',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)] print(L2)
总结：直接用isinstance判断即可