logger.py

import logging
import sys
from logging.handlers import TimedRotatingFileHandler

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

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

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

def get_logger(logger_name, log_file, log_level):
	logger = logging.getLogger(logger_name)

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

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

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

	return logger