对list排序foo = [-5,8,0,4,9,-4,-20,-2,8,2,-4],使用lambda函数从小到大排序
```py
foo = [-5,8,0,4,9,-4,-20,-2,8,2,-4]
a = sorted(foo,key=lambda x:x)
print(a)
// 输出结果
[-20, -5, -4, -4, -2, 0, 2, 4, 8, 8, 9]
```
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