异常处理

try:

　　code

except (Error1,Errror2) as e:　　#抓住目标错误

　　print("error error error" , e)

except Exception as e:　　#抓住所有错误

　　print("未知错误" , e)

else:

　　print("一切正常")

finally:

　　print("不管有错没错，都执行")

 

自定义异常

class AlexException(Exception):
    def __init__(self,msg):
        self.message = msg
    def __str__(self):
        return self.message
try:
    raise AlexException("e = 数据库连不上")     #自己定义的异常
except AlexException as e:
    print(e)