python 新手看到一种写法 ((_, p), _) = parsed，请问是什么意思？

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完整代码

def process_group(parsed):
        ((_, p), _) = parsed
        return p

说这个函数是用来去括号的，这左边到底是个啥？正则，函数式？怎么表达式还能写左边，看不懂啊。。。。

3 replies • 2015-12-17 09:27:31 +08:00

Dec 16, 2015

解包

>>> parsed = ((1, 2), 3)
>>> ((_, p), _) = parsed
>>> p
2

linnchord

Dec 16, 2015

```
>>> a, b = (1, 2)
>>> print a, b
1 2

>>> a, b = ((3, 4), 2)
>>> print a, b
(3, 4) 2

>>> ((a, c), b) = ((3,4), 2)
>>> print a, b, c
3 2 4
```

wwxiong

Dec 17, 2015

元组赋值而已