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只想一夜暴富

#1 Created at ... [Delete] [Delete and Lock User]

L=['Hello','World',18,'Apple',None]

print([x.lower() for x in L if isinstance(x,Iterable)])

sy107@CHINA

#2 Created at ... [Delete] [Delete and Lock User] 
L1 = ['Hello', 'World', 18, 'Apple', None]L2 = [s.lower() for s in L1 if isinstance(s, str) ]print(L2)if L2 == ['hello', 'world', 'apple']:    print('测试通过!')else:    print('测试失败!')
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