python 調用logging函數，函數重複打印的問題

代碼：

def print_log():
	tim = time.strftime('%Y-%m-%d',time.localtime(time.time()))
	logFile = str('{}.log'.format(tim))
	# if os.path.exists('../log/{}.log'.format(time)):
	# 	logFile = '{}.log'.format(time)
	logger = logging.getLogger('../LOG/{}'.format(logFile))
	
	fmt = '%(asctime)s  - %(funcName)s - %(lineno)d - %(name)s - %(levelname)s -%(module)s:  %(message)s'
	format_str = logging.Formatter(fmt)
	logger.setLevel(logging.INFO)

	sh = logging.StreamHandler()#輸出到屏幕
	sh.setFormatter(format_str)

	th = handlers.TimedRotatingFileHandler(filename='../LOG/{}'.format(logFile), when='D', interval=5, encoding='utf-8')
	th.setFormatter(format_str)

	logger.addHandler(sh)
	logger.addHandler(th)
	
	return logger

1. logger.handlers最初是一個空列表，執行‘logger.addHandler(sh)’添加一個‘StreamHandler’，輸出一條日誌
2. 在第二次被調用時，logger.handlers已經存在一個‘StreamHandler’，再次執行‘logger.addHandler(sh)’就會再次添加一個‘StreamHandler’，此時的logger有兩個‘StreamHandler’，輸出兩條重複的日誌
3. 在第三次被調用時，logger.handlers已經存在兩個‘StreamHandler’，再次執行‘logger.addHandler(ch)’就會再次添加一個，此時的logger有三個‘StreamHandler’，輸出三條重複的日誌,

解決辦法：及時清理（logger.handlers.clear）

def print_log():
	tim = time.strftime('%Y-%m-%d',time.localtime(time.time()))
	logFile = str('{}.log'.format(tim))
	# if os.path.exists('../log/{}.log'.format(time)):
	# 	logFile = '{}.log'.format(time)
	logger = logging.getLogger('../LOG/{}'.format(logFile))
	logger.handlers.clear()#及時清理
	fmt = '%(asctime)s  - %(funcName)s - %(lineno)d - %(name)s - %(levelname)s -%(module)s:  %(message)s'
	format_str = logging.Formatter(fmt)
	logger.setLevel(logging.INFO)

	sh = logging.StreamHandler()#輸出到屏幕
	sh.setFormatter(format_str)

	th = handlers.TimedRotatingFileHandler(filename='../LOG/{}'.format(logFile), when='D', interval=5, encoding='utf-8')
	th.setFormatter(format_str)

	logger.addHandler(sh)
	logger.addHandler(th)
	
	return logger