Definitions

Levels

Log levels are defined from 0 to 50 and are a way to tell loggers and handlers which message to catch

Note

levels defined by default :

  • INFO : 10

  • DEBUG : 20

  • WARNING : 30

  • CRITICAL : 40

  • ERROR : 50

Format string

Format strings are strings that contain specific attributes which can be processed by handlers’ formatters and allow to format output message at will

Note

List of attribute can be found here https://docs.python.org/3/library/logging.html#logrecord-attributes

Handlers

A handler is an object linked to loggers which can each individually process messages that are sent through them : checking level and formating. After that they output it to their configured destination, which depends on the type of handler (e.g. from file to web, … )

Note

List of handlers type can be found here https://docs.python.org/3/library/logging.handlers.html

Loggers

Loggers allow the developers to send message that will be caught depending on logger configured level and then sent to configured handlers