L1 = ['Hello', 'World', 18, 'Apple', None]
L2=[s.lower() for s in L1 if isinstance(s,str)]
Sign in to make a reply
关爱脑残有限公司
L1 = ['Hello', 'World', 18, 'Apple', None]
L2=[s.lower() for s in L1 if isinstance(s,str)]