monkey patch example

foo.py

from unittest import TestCase, main
from unittest.mock import patch

# import monkeypatch

from logging import getLogger


log = getLogger('foo')

if __name__ == '__main__':
    log.error("some log message")

monkeypatch.py

import logging

original_getLogger = logging.getLogger


def patched_getLogger(name):
    print("Calling getLogger")
    return original_getLogger(name)

logging.getLogger = patched_getLogger