Python Tutorial 7.4 - Logging in Python

Welcome to the “Logging in Python” tutorial!

Overview

Use the logging module to record events instead of print().

Basic Configuration

import logging

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

logging.debug("Debug message")
logging.info("Info message")
logging.warning("Warning message")
logging.error("Error message")
logging.critical("Critical message")

Writing to a File

logging.basicConfig(
    filename='app.log',
    level=logging.DEBUG,
    format='%(asctime)s %(levelname)s:%(message)s'
)

Log Levels

• DEBUG
• INFO
• WARNING
• ERROR
• CRITICAL

Key Takeaways

• Prefer logging over print for production.
• Configure level and format once at startup.
• Log to files for persistent records.

Happy coding!