shuff打乱排序

发布时间：2020-12-14 00:56:00 所属栏目：Linux 来源：网络整理

导读：import randomalist =[1,2,3,4,5,6,7 ]random.shuffle(alist,random =None) def shuffle(self,x,random= None): if random is None: randbelow = self._randbelow for i in reversed(range(1 ,len(x))): # pick an element in x[:i+1] with which to exchang

import random
alist=[1,2,3,4,5,6,7]
random.shuffle(alist,random=None)

def shuffle(self,x,random=None):
        if random is None:
            randbelow = self._randbelow
            for i in reversed(range(1,len(x))):
                # pick an element in x[:i+1] with which to exchange x[i]
                j = randbelow(i+1)
                x[i],x[j] = x[j],x[i]
        else:
            _int = int
            for i in reversed(range(1,len(x))):
                # pick an element in x[:i+1] with which to exchange x[i]
                j = _int(random() * (i+1))
                x[i],x[j] = x[j],x[i]

shuffle源码

源码没有返回值，打乱的是原列表，所以不能print （random.shuffle(alist,random=None)）

（编辑：李大同）

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