# -*- coding: utf-8 -*-
L1=['Hello','World',18,'Apple',None]
print(L1)
L2=[x.lower() if isinstance(x,str) else x for x in L1 ]
print(L2)
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岁益寒
# -*- coding: utf-8 -*-
L1=['Hello','World',18,'Apple',None]
print(L1)
L2=[x.lower() if isinstance(x,str) else x for x in L1 ]
print(L2)