How to shuffle a 2D list?

Question

Python

Hello! What are some ways to shuffle a two-dimensional list?

Answer 1

Obviously, you can mix in one dimension, you can mix in another, or you can mix in both.

Answer 2

Using a pseudo-random number generator - random()

Answer 3

Usually converted to a one-dimensional list (honestly or using abstraction), shuffled, and resized.
I sketched this mixer:

import random
class Shuffler:
    def __init__(self, lst, depth=2):
        self.lst = lst
        self.depth = depth
        random.shuffle(self)
        
    def __getlevel(self, index, depth):
        curr = self.lst
        curr_depth = depth
        while curr_depth > 0:
            curr_depth -= 1
            curr_size = len(curr)
            curr = curr[index % curr_size]
            index //= curr_size
        return curr, index
    
    
    def __getitem__(self, index):
        value, index = self.__getlevel(index, self.depth)
        if index > 0:
            raise IndexError('list index out of range')
        return value
    
    def __setitem__(self, index, value):
        last_line, line_index = self.__getlevel(index, self.depth - 1)
        last_line[line_index] = value
        return value
    
    def __len__(self):
        acc = 1
        curr = self.lst
        curr_depth = self.depth
        while curr_depth > 0:
            curr_depth -= 1
            acc *= len(curr)
            if acc:
                curr = curr[0]
        return acc

lst = [[i * 10 + j for j in range(10)] for i in range(10)]
Shuffler(lst, 2)
print(*lst, sep='\n')

conclusion:

[45, 50, 74, 1, 3, 29, 43, 2, 93, 68]
[41, 10, 51, 99, 85, 20, 95, 54, 59, 8]
[46, 64, 24, 12 , 26, 15, 6, 76, 39, 5]
[58, 13, 44, 60, 36, 70, 63, 79, 42, 18]
[9, 69, 25, 66, 67, 65, 35, 47 , 23, 87]
[78, 80, 22, 73, 97, 31, 91, 75, 82, 90]
[57, 38, 49, 11, 84, 17, 62, 7, 89, 71]
[40, 30, 86, 94, 21, 53, 14, 19, 0, 32]
[33, 37, 61, 92, 81, 88, 56, 83, 98, 34]
[96, 16, 52, 4, 27, 55, 48, 72, 77, 28]

Answer 4

random.shuffle() - shuffles a one-dimensional array.
You can just walk through the rows of an array (two-dimensional list) and apply to each shuffle. Then apply shuffle to the array itself.
This is if the initial request implies uniform mixing of elements throughout the array.

Answer 5

How to shuffle a list:

from random import shuffle #из модуля "random" импортируем "shuffle"

a = [1, 2, 3, 4, "hello"] #создаём список
shuffle(a) #перемешиваем содержимое переменной "a"
print(a) #выводим переменную "a" с уже перемешенным содержимым

How to get a random value from a list:

from random import choice #из модуля "random" импортируем "choice"

a = ["hello", 1, 10, 15, "hello world"] #создаём список
print(choice(a)) #выводим рандомное значение из переменной "a"