Python: Randomize the order of the values of an list
Python List: Exercise - 221 with Solution
Write a Python program to randomize the order of the values of an list, returning a new list.
- Uses the Fisher-Yates algorithm to reorder the elements of the list.
- random.shuffle provides similar functionality to this snippet.
The Fisher–Yates shuffle is an algorithm for generating a random permutation of a finite sequence—in plain terms, the algorithm shuffles the sequence. The algorithm effectively puts all the elements into a hat; it continually determines the next element by randomly drawing an element from the hat until no elements remain. The algorithm produces an unbiased permutation: every permutation is equally likely. The modern version of the algorithm is efficient: it takes time proportional to the number of items being shuffled and shuffles them in place.
from copy import deepcopy from random import randint def shuffle_list(lst): temp_lst = deepcopy(lst) m = len(temp_lst) while (m): m -= 1 i = randint(0, m) temp_lst[m], temp_lst[i] = temp_lst[i], temp_lst[m] return temp_lst nums = [1, 2, 3, 4, 5, 6] print("Original list: ",nums) print("\nShuffle the elements of the said list:") print(shuffle_list(nums))
Original list: [1, 2, 3, 4, 5, 6] Shuffle the elements of the said list: [3, 2, 4, 1, 6, 5]
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Previous: Write a Python program to map the values of a list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value.
Next: Write a Python program to get the difference between two given lists, after applying the provided function to each list element of both.
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Python: Tips of the Day
When we speak of division we normally mean (/) float division operator, this will give a precise result in float format with decimals.
For a rounded integer result there is (//) floor division operator in Python. Floor division will only give integer results that are round numbers.
print(1000 // 300) print(1000 / 300)
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