Python function log decorator

log_fn_decorator.py

import logging
import time
import inspect

from logging.handlers import RotatingFileHandler
from functools import wraps


class MyFormatter(logging.Formatter):
    def format(self, record):
        record.extra_log_arg = ""
        if record.args:
            record.extra_log_arg = record.args.get("extra_log_arg", "Default value")
        return super().format(record)

def init_logger():
    logger = logging.getLogger('my_logger')
    handler = RotatingFileHandler('my_log.log', maxBytes=2**10 * 1000 * 10, backupCount=10)
    handler.setFormatter(MyFormatter(
        '%(asctime)s %(levelname)s: %(message)s $(extra_log_arg)s [in %(pathname)s:%(lineno)d]'))

    logger.addHandler(handler)
    logger.setLevel(logging.DEBUG)
    logging.Formatter.converter = time.gmtime
    logger.info("Start")

init_logger()

def log_function(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        logger = logging.getLogger('my_logger')

        signature = inspect.signature(func).bind(*args, **kwargs)
        signature.apply_defaults()
        logger.info(f"Enter {func.__name__}{signature}", {"extra_log_arg": "test"})

        value = func(*args, **kwargs)
        logger.info(f"Exit {func.__name__}", {"extra_log_arg": "test"})        

        return value

    return wrapper

@log_function
def foo(name, value=42):
    print(f"In foo with name={name}")

foo("Edi")