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"""

A pure Python implementation of the insertion sort algorithm

This algorithm sorts a collection by comparing adjacent elements.

When it finds that order is not respected, it moves the element compared

backward until the order is correct. It then goes back directly to the

element's initial position resuming forward comparison.

For doctests run following command:

python3 -m doctest -v insertion_sort.py

For manual testing run:

python3 insertion_sort.py

"""

def insertion_sort(collection: list) -> list:

"""A pure Python implementation of the insertion sort algorithm

:param collection: some mutable ordered collection with heterogeneous

comparable items inside

:return: the same collection ordered by ascending

Examples:

>>> insertion_sort([0, 5, 3, 2, 2])

[0, 2, 2, 3, 5]

>>> insertion_sort([]) == sorted([])

True

>>> insertion_sort([-2, -5, -45]) == sorted([-2, -5, -45])

True

>>> insertion_sort(['d', 'a', 'b', 'e', 'c']) == sorted(['d', 'a', 'b', 'e', 'c'])

True

>>> import random

>>> collection = random.sample(range(-50, 50), 100)

>>> insertion_sort(collection) == sorted(collection)

True

>>> import string

>>> collection = random.choices(string.ascii_letters + string.digits, k=100)

>>> insertion_sort(collection) == sorted(collection)

True

"""

for insert_index, insert_value in enumerate(collection[1:]):

temp_index = insert_index

while insert_index >= 0 and insert_value < collection[insert_index]:

collection[insert_index + 1] = collection[insert_index]

insert_index -= 1

if insert_index != temp_index:

collection[insert_index + 1] = insert_value

return collection

if __name__ == "__main__":

from doctest import testmod

testmod()

user_input = input("Enter numbers separated by a comma:\n").strip()

unsorted = [int(item) for item in user_input.split(",")]

print(f"{insertion_sort(unsorted) = }")

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