L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [s.lower() for s in L1 if isinstance(s,str)] print(L2,'晚安，同学们。')
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蝉鸣后又雪
L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [s.lower() for s in L1 if isinstance(s,str)] print(L2,'晚安，同学们。')