How can I randomly seperate a list into 2 lists but with same length

Question

I have a function that wants to seperate one list to 2 lists with same length and random list items

code:

def playersorting(playerslist):
        random.shuffle(playerslist)
        cut = random.randint(0, len(playerslist))
        list_1 = playerslist[:cut]
        list_2 = playerslist[cut:]

        print(list_1)
        print(list_2)


playerslist = ['amin', 'hasan', 'reza', 'mohsen', 'alireza', 'mahdi', 'daniyal', 'komeil']
playersorting(playerslist)

output is like:

['mohsen', 'hasan', 'mahdi', 'daniyal', 'reza', 'alireza']
['amin', 'komeil']

['daniyal', 'amin', 'komeil', 'reza', 'mahdi', 'hasan', 'alireza', 'mohsen']
[]

but I want it to be like this:

['daniyal', 'reza', 'hasan', 'alireza']
['komeil', 'mahdi', 'mohsen', 'amin']

random with same length

Answer 1

Seems you need to change your cut variable

import random

l = ['amin', 'hasan', 'reza', 'mohsen', 'alireza', 'mahdi', 'daniyal', 'komeil']
half_len = len(l)//2

random.shuffle(l)

l1 = l[:half_len]
l2 = l[half_len:]

print(l1, l2)

['mahdi', 'amin', 'mohsen', 'reza'] 
['komeil', 'alireza', 'hasan', 'daniyal']

Answer 2

One way is to use [ random.sample()][1] :

from random import sample

def playersorting(playerslist):
    list_1 = sample(playerslist, len(playerslist) // 2)
    list_2 = [player for player in playerslist if player not in list_1]
    print(list_1)
    print(list_2)


playerslist = ['amin', 'hasan', 'reza', 'mohsen', 'alireza', 'mahdi', 'daniyal', 'komeil']
playersorting(playerslist)

Explanation:

1. random.sample() takes in an array, population , and a number, k , and returns a new array of length k of randomly selected elements from the array population .

2. So sample(playerslist, len(playerslist) // 2) returns an array of length len(playerslist) // 2 of randomly selected elements from playerslist .

3. [player for player in playerslist if player not in list_1] returns every element in playerslist that is not already inside the first half of random elements.

Though the random.shuffle() method is advised.

Answer 3

import random

def playersorting(playerslist):
    random.shuffle(playerslist)
    list_1 = playerslist[0:4]
    list_2 = playerslist[4:8]

    print(list_1)
    print(list_2)


playerslist = ['amin', 'hasan', 'reza', 'mohsen', 'alireza', 'mahdi', 'daniyal', 'komeil']
playersorting(playerslist)

Answer 4

randint just return a integer value ranged from [0,len(playerslist)) , so use cut to slice the list will ends with random two different length.

Simplely, you can just:

def playersorting(playerslist):
        random.shuffle(playerslist)
        cut = int(len(playerslist) / 2)
        list_1 = playerslist[:cut]
        list_2 = playerslist[cut:]

        print(list_1)
        print(list_2)