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How to Configure Python Logging with File Rotation

A complete demo that sets up a logger with a rotating file handler, writes several log entries, and shows the contents of the current log file.

logging file-handler rotating-file-handler

Python

import logging
from logging.handlers import RotatingFileHandler

logger = logging.getLogger("rotating_logger")
logger.setLevel(logging.DEBUG)

file_handler = RotatingFileHandler(
    "app.log",
    maxBytes=100,
    backupCount=3
)
file_handler.setFormatter(
    logging.Formatter("%(asctime)s - %(levelname)s - %(messa…

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