Basic example on how setup a Python logger

log.py

import logging
import sys
from logging.handlers import TimedRotatingFileHandler

FORMATTER = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
LOG_FILE = "my_app.log"

def get_console_handler():
	console_handler = logging.StreamHandler(sys.stdout)
	console_handler.setFormatter(FORMATTER)
	return console_handler

def get_file_handler():
	file_handler = TimedRotatingFileHandler(LOG_FILE, when='midnight')
	file_handler.setFormatter(FORMATTER)
	return file_handler

def get_logger(logger_name):
	logger = logging.getLogger(logger_name)

	logger.setLevel(logging.DEBUG) # better to have too much log than not enough

	logger.addHandler(get_console_handler())
	logger.addHandler(get_file_handler())

	# with this pattern, it's rarely necessary to propagate the error up to parent
	logger.propagate = False

	return logger

I have one suggestion, since I was getting repeating lines in the logs (one for each call of get_logger) and logger. propagate = False didn't help, adding if not logger.hasHandlers(): did:

import logging
import sys
from logging.handlers import TimedRotatingFileHandler

FORMATTER = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
LOG_FILE = "my_app.log"

def get_console_handler():
	console_handler = logging.StreamHandler(sys.stdout)
	console_handler.setFormatter(FORMATTER)
	return console_handler

def get_file_handler():
	file_handler = TimedRotatingFileHandler(LOG_FILE, when='midnight')
	file_handler.setFormatter(FORMATTER)
	return file_handler

def get_logger(logger_name):
    logger = logging.getLogger(logger_name)

    # better to have too much log than not enough
    logger.setLevel(logging.DEBUG)

    if not logger.hasHandlers():
        logger.addHandler(get_console_handler())
        logger.addHandler(get_file_handler())

    # with this pattern, it's rarely necessary to propagate the error up to parent
    logger.propagate = False

    return logger

@homoludens oh that's interesting, do you have a code that produces the code duplication using the get_logger()?