L1 = ['Hello', 'World', 18, 'Apple', None]
L2=[x.lower() for x in L1 if isinstance(x,str)]
print(L2)
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艾米与艾米
L1 = ['Hello', 'World', 18, 'Apple', None]
L2=[x.lower() for x in L1 if isinstance(x,str)]
print(L2)