Python/sorts/insertion_sort.py
Christian Clauss 47a9ea2b0b
Simplify code by dropping support for legacy Python (#1143)
* Simplify code by dropping support for legacy Python

* sort() --> sorted()
2019-08-19 15:37:49 +02:00

43 lines
1.2 KiB
Python

"""
This is a pure python implementation of the insertion sort algorithm
For doctests run following command:
python -m doctest -v insertion_sort.py
or
python3 -m doctest -v insertion_sort.py
For manual testing run:
python insertion_sort.py
"""
def insertion_sort(collection):
"""Pure implementation of the insertion sort algorithm in Python
: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([])
[]
>>> insertion_sort([-2, -5, -45])
[-45, -5, -2]
"""
for loop_index in range(1, len(collection)):
insertion_index = loop_index
while insertion_index > 0 and collection[insertion_index - 1] > collection[insertion_index]:
collection[insertion_index], collection[insertion_index - 1] = collection[insertion_index - 1], collection[insertion_index]
insertion_index -= 1
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(insertion_sort(unsorted))