L1=['hello','world',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)=='Ture'] print(L2)
#或者这样： L1=['hello','world',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)==Ture] print(L2)
True 不是 Ture
。。额没看到下面的，你忽略我吧
True不是str类型
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用户0ddywfyiu8
为什么这样不行
L1=['hello','world',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)=='Ture'] print(L2)
#或者这样： L1=['hello','world',18,'Apple',None] L2=[s.lower() for s in L1 if isinstance(s,str)==Ture] print(L2)