How Does Python's `natsort` Library Achieve Natural Sorting?

Natural Sorting in Python

In Python, the sorted() function sorts strings in ASCIIbetical order. However, for scenarios where a natural sort is desired, a library called natsort comes to the rescue.

Natural Sorting with natsort

natsort provides both a sorting function and a sorting key. For a sorting function, you can use natsorted():

from natsort import natsorted

l = ['Elm11', 'Elm12', 'Elm2', 'elm0', 'elm1', 'elm10', 'elm13', 'elm9']
natsorted(l, key=lambda y: y.lower())

This will sort the list according to natural ordering ('elm0', 'elm1', etc.).

Sorting Key with natsort_keygen

If a sorting key is more suitable, you can use natsort_keygen():

from natsort import natsort_keygen

l = ['Elm11', 'Elm12', 'Elm2', 'elm0', 'elm1', 'elm10', 'elm13', 'elm9']
sort_key = natsort_keygen(key=lambda y: y.lower())
l.sort(key=sort_key)

This will sort the list in the same natural order.

Special Case: Sorting like Windows Explorer

natsort also provides the os_sorted function to sort in the same order as the file system browser on a particular operating system:

from natsort import os_sorted

paths = ['path/to/file1', 'path/to/file10', 'path/to/file2']
os_sorted(paths)

This will sort the paths according to the operating system's file explorer.

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