L1 = ['Hello','World',18,'Apple'] L2=[n.lower() for n in L1 if isinstance(n,str)== True] print (L2) if L2 == ['hello','world','apple']: print('测试通过！') else : print('测试失败！')
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L1 = ['Hello','World',18,'Apple'] L2=[n.lower() for n in L1 if isinstance(n,str)== True] print (L2) if L2 == ['hello','world','apple']: print('测试通过！') else : print('测试失败！')