# -*- coding: utf-8 -*- L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = [s.lower() for s in L1 if isinstance(s,str)]
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状元刚01
# -*- coding: utf-8 -*- L1 = ['Hello', 'World', 18, 'Apple', None]L2 = [s.lower() for s in L1 if isinstance(s,str)]