L1=['Hello','World',18,'Apple',None] L2=[s.lower()for s in L1 if isinstance(s,str)] L3=[(lambda s:s.lower()if isinstance(s,str) else s)(s)for s in L1] print(L2) print(L3)
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少年丶喝酒不
L1=['Hello','World',18,'Apple',None] L2=[s.lower()for s in L1 if isinstance(s,str)] L3=[(lambda s:s.lower()if isinstance(s,str) else s)(s)for s in L1] print(L2) print(L3)