best logging code for python code example

Example 1: python logging to file

import logging

"""
DEBUG
INFO
WARNING
ERROR
CRITICAL
"""
# asctime: time of the log was printed out
# levelname: name of the log
# datefmt: format the time of the log
# give DEBUG log
logging.basicConfig(format='%(asctime)s %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
    datefmt='%d-%m-%Y:%H:%M:%S',
    level=logging.DEBUG,
    filename='logs.txt')

logger = logging.getLogger('my_app')

logger.debug("This is a debug log")
logger.info("This is an info log")
logger.critical("This is critical")
logger.error("An error occurred")

Example 2: testing logging python

# can be done by using unittest's assertLogs

from unittest import TestCase

class MyTest(TestCase):
  
  def test_logs(self):
    with self.assertLogs('foo', level='INFO') as cm:
        logging.getLogger('foo').info('first message')
        logging.getLogger('foo.bar').error('second message')
        self.assertEqual(cm.output, ['INFO:foo:first message',
                                 'ERROR:foo.bar:second message'])