# -*- coding:utf-8 -*-
L1=['Hello','World',18,'Apple',None]
L2=[s.lower() for s in L1 if isinstance(s,str)==True]
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你的女孩Y__Y
# -*- coding:utf-8 -*-
L1=['Hello','World',18,'Apple',None]
L2=[s.lower() for s in L1 if isinstance(s,str)==True]