Out of curiosity, I wanted to know what ufw (uncomplicated Firewall) was made up of. So, I looked for it:

$ which ufw
/usr/sbin/ufw

Yours might be somewhere else. I then paid the directory a visit and checked what the file was made up of:

$ cd /usr/sbin
$ file ufw
ufw: Python script, ASCII text executable

I then opened it with vim, but since I can open it here, let me show you some part of it:

$ head ufw
#! /usr/bin/python3
#
# ufw: front-end for Linux firewalling (cli)
#
# Copyright 2008-2021 Canonical Ltd.
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3,
#    as published by the Free Software Foundation.
#
$ grep 'import' ufw
from __future__ import print_function
import os
import sys
import warnings
import ufw.frontend
from ufw.common import UFWError
from ufw.util import error, warn, msg, _findpath, create_lock, release_lock
import gettext

The first command head prints the first ten lines of the file, while the second command grep prints all the lines that contain import in it.

So, it turns out, ufw is “just” a python script bundled with a package that lives somewhere in sys.path.

Conclusion

So, I wonder, which other tools I use regularly are also python scripts?