L1 = ['Hello', 'World', 18, 'Apple', None] print('结果为： L2 =',[s.lower() for s in L1 if isinstance(s, str) and s != None])
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L1 = ['Hello', 'World', 18, 'Apple', None] print('结果为： L2 =',[s.lower() for s in L1 if isinstance(s, str) and s != None])