Search code snippets, questions, articles...

Randomly shuffle a list in python (Best Practices)

Python provides a number of ways to randomly shuffle a list. The most common is to use the shuffle() method from the random module. This method takes a list and shuffles it in place, returning None.

Solution 1: Using random.shuffle() function of random module

To shuffle a list in python, you can use the random.shuffle() function. This function only shuffles the innermost nested list present in the given list. It doesn’t return any value.

We need to import the random module of Python to use the random.shuffle() function. To understand it better, check the below Python code example.

Syntax

random.shuffle(myList)

Code example 1: Create a list of n numbers and shuffle them

import random

my_list = list(range(0, 10))
print("Original list is: ", my_list)

random.shuffle(my_list)
print("Shuffled list is: ", my_list)

Output

Original list is:  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Shuffled list is:  [9, 6, 5, 0, 8, 2, 3, 4, 7, 1]

In the above code example, we have created a list of n numbers using range() function and then shuffled it.

Code example 2:

import random

numbers = [10, 20, 30, 40, 50, 60]
print('Original List: ', numbers)

random.shuffle(numbers)

print('Shuffled list: ', numbers)

Output

Original List:  [10, 20, 30, 40, 50, 60]
Shuffled list:  [40, 30, 60, 50, 20, 10]

The above code example imports the random module and then creates a list of numbers. It shuffles the list of numbers using the shuffle method from the random module and then prints the shuffled list.

import random

def shuffle_list(my_list):
    random.shuffle(my_list)
    return my_list

print(shuffle_list(['John', 'Mark', 'Carl', 'Henry']))
print(shuffle_list([1, 2, 3, 4, 5, 6, 7, 8]))
['Carl', 'Mark', 'John', 'Henry']
[4, 2, 1, 6, 5, 8, 3, 7]

This is a Python code example of how to shuffle a list. The shuffle_list() function takes a list as an argument and shuffles it using the random module. Then it returns the shuffled list.

Solution 2: Using random.sample() function

If you need to shuffle a list in python, you can use the random.sample() function. This function will take a list as an input and randomly shuffle it. You can also specify the number of items you want to shuffle.

Syntax

random.sample(myList, len(myList))

Code example

import random

numbers = [1, 2, 3, 4, 5, 6, 7, 8]

result = random.sample(numbers, len(numbers))

print('Original list is: ', numbers)
print('Shuffled list is: ', result)

Output

Original list is:  [1, 2, 3, 4, 5, 6, 7, 8]
Shuffled list is:  [7, 2, 1, 6, 8, 4, 5, 3]

This code is an example of how to shuffle a list in Python. The result will be a new list with the same elements as the original list, but in a random order.

Solution 3: Using numpy random.shuffle() function

If you have a list of items in Python, you can use the NumPy random.shuffle() function to randomly shuffle the items.

The shuffle() function takes a list as a parameter and shuffles the items in the list in place. This means that the original list is changed and the shuffled list is returned.

import numpy as np

# create a list
numbers = np.arange(10)
print('Original list: ', numbers)

np.random.shuffle(my_list)
print('Shuffled list is: ', my_list)

Output

Original list:  [0 1 2 3 4 5 6 7 8 9]
Shuffled list is:  [6, 8, 4, 7, 5, 9, 2, 1, 3, 0]

The example above imports the NumPy package and creates a list of numbers from 0 to 9. It then shuffles the list using the random.shuffle() function.

Was this helpful?
0 Comments