L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [x.lower() for x in L1 if isinstance(x, str) == True]
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落之萧萧
L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [x.lower() for x in L1 if isinstance(x, str) == True]