Natural Sort in python

natsort.py

import re
convert = lambda text: int(text) if text.isdigit() else text.lower()
alphanum = lambda key: [convert(c) for c in re.split('([0-9]+)', key)]

sorted(items, key=alphanum)

# another solution
natsort = lambda s: [int(t) if t.isdigit() else t.lower() for t in re.split('(\d+)', s)]
sorted(items, key=natsort)

Use re.split('([0-9]+)', str(key)) if use with pathlib Path.