## Python, sort, odd_even_sort.py

``````"""For reference
https://en.wikipedia.org/wiki/Odd%E2%80%93even_sort
"""

def odd_even_sort(input_list: list) -> list:
"""this algorithm uses the same idea of bubblesort,
but by first dividing in two phase (odd and even).
Originally developed for use on parallel processors
with local interconnections.
:param collection: mutable ordered sequence of elements
:return: same collection in ascending order
Examples:
>>> odd_even_sort([5 , 4 ,3 ,2 ,1])
[1, 2, 3, 4, 5]
>>> odd_even_sort([])
[]
>>> odd_even_sort([-10 ,-1 ,10 ,2])
[-10, -1, 2, 10]
>>> odd_even_sort([1 ,2 ,3 ,4])
[1, 2, 3, 4]
"""
sorted = False
while sorted is False:  # Until all the indices are traversed keep looping
sorted = True
for i in range(0, len(input_list) - 1, 2):  # iterating over all even indices
if input_list[i] > input_list[i + 1]:

input_list[i], input_list[i + 1] = input_list[i + 1], input_list[i]
# swapping if elements not in order
sorted = False

for i in range(1, len(input_list) - 1, 2):  # iterating over all odd indices
if input_list[i] > input_list[i + 1]:
input_list[i], input_list[i + 1] = input_list[i + 1], input_list[i]
# swapping if elements not in order
sorted = False
return input_list

if __name__ == "__main__":
print("Enter list to be sorted")
input_list = [int(x) for x in input().split()]
# inputing elements of the list in one line
sorted_list = odd_even_sort(input_list)
print("The sorted list is")
print(sorted_list)
``````