18.1. Logging About

Important

• Do not print

• Always use logger

• Logs can be displayed on console

• Logs can be redirected to file

• Logs can be redirected to database

• Logs can be silenced (certain level)

• Logs can be rotated

• Logs can change format

✘

>>> import logging
>>>
>>>
>>> def run():
...     logging.warning('Program start')
...     for number in range(0,3):
...         logging.info(f'Current number: {number}')
...     logging.warning('Program end')
>>>
>>>
>>> run()
WARNING:root:Program start
WARNING:root:Program end

18.1.1. Further Reading

• https://pyvideo.org/pycon-au-2018/a-guided-tour-of-python-logging.html

• https://docs.python.org/3/howto/logging.html

• https://docs.python.org/3/library/logging.html#module-logging

• https://docs.python.org/3/library/logging.config.html#module-logging.config

• https://docs.python.org/3/library/logging.handlers.html#module-logging.handlers