Python 记录异常和写日志

1. python 2 :

try:
	my_fun()
except exceptions as e:
	print (e)

2. python3:

try:
	my_fun()
except Exception as e:
	print (e)

3. 创建日志，在控制台和日志文件中同时输出日志：

def setLogger(log_name):
    # 创建一个logger,可以考虑如何将它封装
    logger = logging.getLogger('mylogger')
    logger.setLevel(logging.DEBUG)

    # 创建一个handler，用于写入日志文件
    fh = logging.FileHandler(os.path.join(os.getcwd(), str(log_name)  + '_log.txt'))
    fh.setLevel(logging.DEBUG)

    # 再创建一个handler，用于输出到控制台
    ch = logging.StreamHandler()
    ch.setLevel(logging.DEBUG)

    # 定义handler的输出格式
    formatter = logging.Formatter('%(asctime)s - %(module)s.%(funcName)s.%(lineno)d - %(levelname)s - %(message)s')
    fh.setFormatter(formatter)
    ch.setFormatter(formatter)

    # 给logger添加handler
    logger.addHandler(fh)
    logger.addHandler(ch)
    
    return logger


用法：
# 获取日志配置对象
log_name = 'log_name'
logger = setLogger(log_name)
def get_log_1(b ,logger):
    res_flag = False
    global res
    try:
        a = 10
        res = a/b
        res_flag = True
    except Exception as e:
    	# 记录一条错误日志信息，记录抛出的异常
        logger.error(e)
    # 记录一条结果信息日志
    logger.info('res is ' + str(res))
    logger.info('res_flag is ' + str(res_flag))
    return res, res_flag