任何可迭代对象(列表、元祖、字符串、文件对象、迭代器和生成器等)，都可以通过一个简单的赋值语句拆包并赋值给多个变量，但是要保证变量的数量和可迭代对象元素的数量一致。

1. 常见写法

>>> p = (1, 2)
>>> x, y = p
>>> x
1
>>> y
2
>>>
>>> data = [ clip, 23, 172, (2018, 10, 22) ]
>>> name, age, height, birth= data
>>> name
clip
>>> birth
(2018, 10, 22)
>>> name, age, height, (year, mon, day) = data
>>> name
clip
>>> year
2018
>>> mon
10
>>> day
22
>>>

2. 对不需要的元素进行占位

>>> data = [ 'clip', 23, 172, (2018, 10, 22) ]
>>> _, age, height, _ = data
>>> age
23
>>> height
172
>>> *_, height, birth = data
>>> height
172
>>> birth
(2018, 10, 22)
>>> name, *_, (*_, day) = data
>>> name
'clip'
>>> day
22
>>>