L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [] for x in L1: if isinstance(x,str): L2.append(x.lower()) print (L2)
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休耕
L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [] for x in L1: if isinstance(x,str): L2.append(x.lower()) print (L2)