bogo_sort.py

"""
This is a pure Python implementation of the bogosort algorithm,
also known as permutation sort, stupid sort, slowsort, shotgun sort, or monkey sort.
Bogosort generates random permutations until it guesses the correct one.

More info on: https://en.wikipedia.org/wiki/Bogosort

For doctests run following command:
python -m doctest -v bogo_sort.py
or
python3 -m doctest -v bogo_sort.py
For manual testing run:
python bogo_sort.py
"""

import random


def bogo_sort(collection):
    """Pure implementation of the bogosort algorithm in Python
    :param collection: some mutable ordered collection with heterogeneous
    comparable items inside
    :return: the same collection ordered by ascending
    Examples:
    >>> bogo_sort([0, 5, 3, 2, 2])
    [0, 2, 2, 3, 5]
    >>> bogo_sort([])
    []
    >>> bogo_sort([-2, -5, -45])
    [-45, -5, -2]
    """

    def is_sorted(collection):
        if len(collection) < 2:
            return True
        for i in range(len(collection) - 1):
            if collection[i] > collection[i + 1]:
                return False
        return True

    while not is_sorted(collection):
        random.shuffle(collection)
    return collection


if __name__ == "__main__":
    user_input = input("Enter numbers separated by a comma:\n").strip()
    unsorted = [int(item) for item in user_input.split(",")]
    print(bogo_sort(unsorted))