spam,ham]=['yum','YUM'] 列表赋值运算(位置性)
a,b,c,d='spam' 序列赋值运算,通用性
a,b,c = [1,2,3]
a,*b = 'spam' 扩展的序列解包(Python3.0...---------------------------------------------------------------------------------------------------
Python3.0...a,*b = 'spam'
>>> a,b
('s', ['p', 'a', 'm'])
>>> a,*b,c = 'spam'
>>> a,b,c
('s', ['p', 'a'], 'm')
Python3.0