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交作业……总是和大家的节奏不一样啊，以后要好好审题

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我会掏鸟蛋啊

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

为什么我总是想出这么笨这么冗长的程序……( ＿ ＿)ノ｜扶墙

# -*- coding: utf-8 -*-

def f(L):
    N=[]
    for n in L:
        if isinstance(n,str):
            N.append(n.lower())
        else:
            N.append(n)
    print(N)
L1 = ['Hello', 'World', 18, 'Apple', None]
L2=f(L1)

Sam宅一

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

```[s.lower() for s in L1 if isinstance(s,str)]

```

秋风的漫步

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

else 那个语句应该不要吧

頼永棍

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

你的函数还应该return N
这样L2才能是一个list，不然为None

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