How to use the logging module in Python?

To use the logging module in Python, you need to set it up following these steps:

1. Import the logging module:

import logging

1. Set the log recording level:

logging.basicConfig(level=logging.INFO)

The logging module provides multiple levels to control the output of logs, including DEBUG, INFO, WARNING, ERROR, and CRITICAL. You can use different levels according to your needs.

1. Record logs using a logger.

logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical message')

You can utilize various log levels and corresponding log functions according to your needs, such as debug, info, warning, error, and critical.

1. Set up the format for logging.

logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')

Different placeholders are available in the format parameter to define the log format, such as asctime for time, name for logger name, levelname for log level, and message for message content.

1. Write the log records to a file.

logging.basicConfig(filename='app.log', filemode='w', format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')

You can specify the file name for logging output using the filename parameter, and the writing mode can be specified using the filemode parameter, which is set to append mode by default.

This is a basic usage example that you can further configure and use the logging module to record logs as needed.