Logging

Introduction

Logging provides a way to track events during program execution, better than print statements.

Basic Logging

import logging

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

logger.debug("Debug message")
logger.info("Info message")
logger.warning("Warning message")
logger.error("Error message")

Configuration

logging.basicConfig(
    level=logging.DEBUG,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
    handlers=[
        logging.FileHandler("app.log"),
        logging.StreamHandler()
    ]
)

Log Levels

Practice Problems

1. Set up logging with file output
2. Create logger per module
3. Use different log levels
4. Configure log formatting
5. Rotate log files