L1 = ['Hello', 'World', 18, 'Apple', None] L2=[]
[L2.append(s.lower()) if isinstance(s,str) else L2.append(s) for s in L1 ]
print(L2)
结果 ['hello', 'world', 18, 'apple', None]
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用户4403728317
L1 = ['Hello', 'World', 18, 'Apple', None] L2=[]
[L2.append(s.lower()) if isinstance(s,str) else L2.append(s) for s in L1 ]
加了一个三元表达式，一条代码解决迭代，判断，写入
print(L2)
结果 ['hello', 'world', 18, 'apple', None]