从列表中或数组中随机抽取固定数量的元素组成新的数组或列表

>>> import random
>>> mylist=list(range(1,10))
>>> mylist
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> newlist = random.sample(mylist, 3)  #从mylist中随机获取3个元素
>>> newlist
[4, 7, 2]
>>> newlist = random.sample(mylist, 3)  #从mylist中随机获取3个元素
>>> newlist
[4, 3, 1]
>>> newlist = random.sample(mylist, 3)  #从mylist中随机获取3个元素
>>> newlist
[5, 9, 3]
>>>