mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 05:21:09 +00:00
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
"""
|
|
This is pure python implementation of quick sort algorithm
|
|
|
|
For doctests run following command:
|
|
python -m doctest -v quick_sort.py
|
|
or
|
|
python3 -m doctest -v quick_sort.py
|
|
|
|
For manual testing run:
|
|
python quick_sort.py
|
|
"""
|
|
from __future__ import print_function
|
|
|
|
|
|
def quick_sort(collection):
|
|
"""Pure implementation of quick sort algorithm in Python
|
|
|
|
:param collection: some mutable ordered collection with heterogeneous
|
|
comparable items inside
|
|
:return: the same collection ordered by ascending
|
|
|
|
Examples:
|
|
>>> quick_sort([0, 5, 3, 2, 2])
|
|
[0, 2, 2, 3, 5]
|
|
|
|
>>> quick_sort([])
|
|
[]
|
|
|
|
>>> quick_sort([-2, -5, -45])
|
|
[-45, -5, -2]
|
|
"""
|
|
less = []
|
|
equal = []
|
|
greater = []
|
|
if len(collection) > 1:
|
|
pivot = collection[0]
|
|
for x in collection:
|
|
if x < pivot:
|
|
less.append(x)
|
|
if x == pivot:
|
|
equal.append(x)
|
|
if x > pivot:
|
|
greater.append(x)
|
|
return quick_sort(less) + equal + quick_sort(greater)
|
|
else:
|
|
return collection
|
|
|
|
|
|
if __name__ == '__main__':
|
|
import sys
|
|
|
|
# For python 2.x and 3.x compatibility: 3.x has not raw_input builtin
|
|
# otherwise 2.x's input builtin function is too "smart"
|
|
if sys.version_info.major < 3:
|
|
input_function = raw_input
|
|
else:
|
|
input_function = input
|
|
|
|
user_input = input_function('Enter numbers separated by coma:\n')
|
|
unsorted = [int(item) for item in user_input.split(',')]
|
|
print(quick_sort(unsorted))
|