python Logger using example with Singleton Pattern

MyLogger.py

# -*- coding: utf-8 -*-
import logging
import os
import datetime
import time


class SingletonType(type):
    _instances = {}

    def __call__(cls, *args, **kwargs):
        if cls not in cls._instances:
            cls._instances[cls] = super(SingletonType, cls).__call__(*args, **kwargs)
        return cls._instances[cls]

# python 3 style
class MyLogger(object, metaclass=SingletonType):
    # __metaclass__ = SingletonType   # python 2 Style
    _logger = None

    def __init__(self):
        self._logger = logging.getLogger("crumbs")
        self._logger.setLevel(logging.DEBUG)
        formatter = logging.Formatter('%(asctime)s \t [%(levelname)s | %(filename)s:%(lineno)s] > %(message)s')

        now = datetime.datetime.now()
        dirname = "./log"

        if not os.path.isdir(dirname):
            os.mkdir(dirname)
        fileHandler = logging.FileHandler(dirname + "/log_" + now.strftime("%Y-%m-%d")+".log")

        streamHandler = logging.StreamHandler()

        fileHandler.setFormatter(formatter)
        streamHandler.setFormatter(formatter)

        self._logger.addHandler(fileHandler)
        self._logger.addHandler(streamHandler)

        print("Generate new instance")

    def get_logger(self):
        return self._logger

# a simple usecase 
if __name__ == "__main__":
    logger = MyLogger.__call__().get_logger()
    logger.info("Hello, Logger")
    logger.debug("bug occured")

참고
http://egloos.zum.com/mataeoh/v/7081556
https://stackoverflow.com/questions/6760685/creating-a-singleton-in-python
http://ourcstory.tistory.com/97

'time' imported but unused

Thanks for example! I simplified it a bit using __new__:

import logging
import os
import datetime


class MyLogger:
    _logger = None

    def __new__(cls, *args, **kwargs):
        if cls._logger is None:

            print("Logger new")
            cls._logger = super().__new__(cls, *args, **kwargs)
            cls._logger = logging.getLogger("crumbs")
            cls._logger.setLevel(logging.DEBUG)
            formatter = logging.Formatter(
                '%(asctime)s \t [%(levelname)s | %(filename)s:%(lineno)s] > %(message)s')

            now = datetime.datetime.now()
            dirname = "./log"

            if not os.path.isdir(dirname):
                os.mkdir(dirname)
            fileHandler = logging.FileHandler(
                dirname + "/log_" + now.strftime("%Y-%m-%d")+".log")

            streamHandler = logging.StreamHandler()

            fileHandler.setFormatter(formatter)
            streamHandler.setFormatter(formatter)

            cls._logger.addHandler(fileHandler)
            cls._logger.addHandler(streamHandler)

        return cls._logger


# a simple usecase
if __name__ == "__main__":
    logger = MyLogger()
    logger.info("Hello, Logger")
    logger = MyLogger()
    logger.debug("bug occured")

Thank you for sharing, exactly what I need 👍

Excellent , working perfect and the formatting done well

You should probably better use a metaclass.

Why there are two assignments to the same variable? Isn't that the second one will overwrite the first?
cls._logger = super().new(cls, *args, **kwargs)
cls._logger = logging.getLogger("crumbs")