打乱一个排好序的list对象alist？

方法一

import random
alist= [1, 2, 3, 4, 5]
random.shuffle(alist)
print(alist)   # alist会被改变

方法二

import random
alist = [1, 2, 3, 4, 5]
blist = random.sample(alist, len(alist))
print(blist)  # alist未改变