python 调用logging函数，函数重复打印的问题_调用时重复打印

代码：

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()#输出到屏幕
	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最初是一个空列表，执行‘logger.addHandler(sh)’添加一个‘StreamHandler’，输出一条日志
2. 在第二次被调用时，logger.handlers已经存在一个‘StreamHandler’，再次执行‘logger.addHandler(sh)’就会再次添加一个‘StreamHandler’，此时的logger有两个‘StreamHandler’，输出两条重复的日志
3. 在第三次被调用时，logger.handlers已经存在两个‘StreamHandler’，再次执行‘logger.addHandler(ch)’就会再次添加一个，此时的logger有三个‘StreamHandler’，输出三条重复的日志,

解决办法：及时清理（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()#及时清理
	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()#输出到屏幕
	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