Python logging

best practices:
http://victorlin.me/posts/2012/08/26/good-logging-practice-in-python



Logging exceptions logging.exception

code for logging in ipython notebook (jupyter)

import logging
import datetime
import sys, os

def prepare_logger(logger, level=logging.DEBUG, filename_template="logs/notebook_log_{}.txt"):
    def prepare_handler(handler):
        handler.setLevel(level)
        handler.setFormatter(formatter)
        return handler
   
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
   
    path_file = filename_template.format(datetime.datetime.now().isoformat())
   
    path_dir = os.path.dirname(path_file)
    if not os.path.exists(path_dir):
        os.makedirs(path_dir)
     
    del logger.handlers[:]
    logger.handlers.append(prepare_handler(logging.FileHandler(path_file)))
    logger.handlers.append(prepare_handler(logging.StreamHandler(sys.stderr)))
   
    logger.setLevel(level=level)
    return logger

logger = logging.getLogger()
logger = prepare_logger(logger, level=logging.DEBUG)