python random扩展随机数函数shuffle(seq)

扩展随机数函数shuffle(seq),将序列seq中的元素随机排列，返回打乱后的序列。

代码及运行结果如下：

>>> import random
>>> s=[1,2,3,4,5,6,7,8,9,10]
>>> random.shuffle(s)
>>> print(s)
[1, 3, 6, 5, 4, 9, 2, 10, 7, 8]
>>> random.shuffle(s)
>>> print(s)
[10, 9, 4, 5, 6, 7, 1, 2, 3, 8]
>>> random.shuffle(s)
>>> print(s)
[7, 3, 9, 8, 5, 10, 6, 1, 4, 2]