异常处理

 1 date = []
 2 dict1 = {‘name‘:‘zsq‘ , ‘age‘:5}
 3 
 4 #自定义异常类定义
 5 class ZsqException(Exception):
 6     def __init__(self, message):
 7         self.message = message
 8 
 9 try:
10     date[3] #触发IndexError
11     dict1[‘name1‘]  #触发Exception
12     pass
13     raise ZsqException(‘自定义异常‘) #自定义异常调用
14 except ZsqException as e:
15     print(e)
16 except IndexError as e:  #针对具体异常进行捕获
17     print(‘索引错误‘, e)
18 except Exception as e: #没有定义的异常会在此捕获
19     print(‘出错了，未知错误‘, e)
20 
21 finally: #不论程序是否报错都会执行该语句
22     print(‘程序结束‘)