python - Log only severity level error and above messages into error.log & also log all the messages into debug.log

debug.log

4 divided by 2
4 divided by 0
Zero division error
Traceback (most recent call last):
  File "logging_example.py", line 27, in division
    return a/b
ZeroDivisionError: division by zero

error.log

Zero division error
Traceback (most recent call last):
  File "logging_example.py", line 27, in division
    return a/b
ZeroDivisionError: division by zero

logging_into_file.py

"""
* Log all the messages into debug.log
* Log only severity level error and above messages into error.log
"""

import logging
from logging import FileHandler

# create logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG) # handles messages of severity DEBUG and above

# create a handler to log all messages of sevirity DEBUG and above.
debug_handler = FileHandler("debug.log")
debug_handler.setLevel(logging.DEBUG)

# create a handler to log all messages of sevirity ERROR and above.
error_handler = FileHandler("error.log")
error_handler.setLevel(logging.ERROR)


# add handlers to logger.
# logger sends all the incoming messages to all the handlers.
logger.addHandler(debug_handler)
logger.addHandler(error_handler)

def division(a, b):
    logger.debug(f"{a} divided by {b}")  # this message comes only in debug.log
    try:
        return a/b
    except ZeroDivisionError:
        logger.error("Zero division error", exc_info=True) # this message comes in both error.log & debug.log


if __name__ == "__main__":
    division(4, 2)
    division(4, 0)