Python/sorts/natural_sort.py
Mozartus f0033f87e0
Create natural_sort.py ()
* add natural_sort.py

* fix doctest

* add 're' to requirements.txt and fix spelling errors

* delete 're' from requirements.txt

* fixing linting errors

* Update sorts/natural_sort.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Update sorts/natural_sort.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Update natural_sort.py

Co-authored-by: Christian Clauss <cclauss@me.com>
2020-10-15 13:45:17 +02:00

37 lines
1.2 KiB
Python

from __future__ import annotations
import re
def natural_sort(input_list: list[str]) -> list[str]:
"""
Sort the given list of strings in the way that humans expect.
The normal Python sort algorithm sorts lexicographically,
so you might not get the results that you expect...
>>> example1 = ['2 ft 7 in', '1 ft 5 in', '10 ft 2 in', '2 ft 11 in', '7 ft 6 in']
>>> sorted(example1)
['1 ft 5 in', '10 ft 2 in', '2 ft 11 in', '2 ft 7 in', '7 ft 6 in']
>>> # The natural sort algorithm sort based on meaning and not computer code point.
>>> natural_sort(example1)
['1 ft 5 in', '2 ft 7 in', '2 ft 11 in', '7 ft 6 in', '10 ft 2 in']
>>> example2 = ['Elm11', 'Elm12', 'Elm2', 'elm0', 'elm1', 'elm10', 'elm13', 'elm9']
>>> sorted(example2)
['Elm11', 'Elm12', 'Elm2', 'elm0', 'elm1', 'elm10', 'elm13', 'elm9']
>>> natural_sort(example2)
['elm0', 'elm1', 'Elm2', 'elm9', 'elm10', 'Elm11', 'Elm12', 'elm13']
"""
def alphanum_key(key):
return [int(s) if s.isdigit() else s.lower() for s in re.split("([0-9]+)", key)]
return sorted(input_list, key=alphanum_key)
if __name__ == "__main__":
import doctest
doctest.testmod()