Python 的zip()函数和 *解包参数列表

python官方文档5.6节，循环的技巧里用了一个zip函数来匹配元素，文档示例如下：

当同时在两个或更多序列中循环时，可以用 zip() 函数将其内元素一一匹配。

questions = [‘name’, ‘quest’, ‘favorite color’]
answers = [‘lancelot’, ‘the holy grail’, ‘blue’]
for q, a in zip(questions, answers):
… print(‘What is your {0}? It is {1}.’.format(q, a))
…
What is your name? It is lancelot.
What is your quest? It is the holy grail.
What is your favorite color? It is blue.
··

但我用zip()函数时遇到了问题：

def fun(str):
    print (str)    
    print (*str)    
    x,y=zip(