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作业有个问题

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随风摆动的桦树

#1 Created at ... [Delete] [Delete and Lock User] 
L=['Hlleo','World',18,'Apple',None]
X=[s.lower() for s in L if isinstance(s, str)]
print(L)
print(X)

完成这个很简单，但是我对题目的理解是，把大写变小写，而其他不变。但是通过上面的代码就只能做到保留字符型，18，None都没了~~~ print结果为： [hello,world,apple] 而不是： [hello,world,18,apple,None]

然后想问，用列表生成器可以直接达到我想的那种结果吗？

随风摆动的桦树

#2 Created at ... [Delete] [Delete and Lock User]

好吧 我看到博主的期待输出了……眼拙了

zyz_hit

#3 Created at ... [Delete] [Delete and Lock User]

[d.lower() if isinstance(d,str) else d for d in L]

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