Use the built-in `logging` module to log messages at various severity levels. Configure logging settings to direct output to files, streams, or external systems.

Implementing logging in your Python application is essential for tracking events and debugging. The built-in logging module provides a flexible framework for logging messages at different severity levels, including DEBUG, INFO, WARNING, ERROR, and CRITICAL. To begin using logging, import the module and set up a basic configuration:

import logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

This configuration sets the logging level to INFO and specifies the output format for log messages. You can then log messages using methods like logging.debug(), logging.info(), logging.warning(), and logging.error(). Additionally, you can configure the logging system to output messages to different destinations, such as console output, files, or external logging systems like Syslog or Fluentd. To log to a file, you can specify a filename in the configuration:

logging.basicConfig(filename='app.log', level=logging.DEBUG)

By effectively utilizing the logging module, you can gain valuable insights into your application’s behavior and facilitate easier debugging.