How do I use loggers and handlers in Python logging?

How do I use loggers and handlers in Python logging?

In Python, loggers are used to log messages, while handlers send those messages to their final destination. You can create a logger using logging.getLogger(name) and add handlers like StreamHandler or FileHandler.

Can you show me a simple example of using a logger and a handler?

Sure! Here's a basic example:

import logging

# Create a logger
logger = logging.getLogger('my_logger')
logger.setLevel(logging.DEBUG)

# Create a handler
handler = logging.StreamHandler()
handler.setLevel(logging.DEBUG)

# Create a formatter and set it for the handler
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)

# Add the handler to the logger
logger.addHandler(handler)

# Log a message
logger.debug('This is a debug message')

What are the different log levels I can use?

The different log levels in Python logging are:

• DEBUG
• INFO
• WARNING
• ERROR
• CRITICAL You can set the level of the logger or handler to control which messages are logged.

How can I log messages to a file instead of the console?

To log messages to a file, you can use FileHandler instead of StreamHandler. Here's how:

file_handler = logging.FileHandler('my_log.log')
logger.addHandler(file_handler)