How can the default handler of Python logger be substituted?

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The default handler of the Python logger can be substituted by creating a new handler object and adding it to the logger instance.

Here's an example:

import logging

# Create a new handler object
handler = logging.FileHandler('mylog.log')

# Set the formatter for the handler
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
handler.setFormatter(formatter)

# Get the root logger and remove the old handler
root_logger = logging.getLogger()
for old_handler in root_logger.handlers:
    root_logger.removeHandler(old_handler)

# Add the new handler to the root logger
root_logger.addHandler(handler)

In this example, a new FileHandler object is created and a formatter is set for it. The existing handlers of the root logger are then removed using a for loop, and the new handler is added to the root logger using the addHandler method.

After this code is executed, any logging calls made using the default logger will be handled by the new FileHandler.