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python Logger using example with Singleton Pattern
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# -*- 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") |
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