Python自定义异常及抛出异常

 """
     自定义异常
 """
 class MyException(Exception): # 继承异常类
     def __init__(self, name, reason):
         self.name = name
         self.reason = reason

 from datetime import datetime
 try:
     if str(datetime.now()) > "":
         raise MyException("TimeoutException", "time is overtime...")
 except MyException as e:
     print(e.name +":"+e.reason)

 """
     抛出异常
 """
 try:
     6/0
     raise
 except Exception as e:
     print(e)

 8 try:
 9     print("--------------")
10 except NameError as e: # 捕获NameError类型异常
11     print(e)
12 except Exception as e: # 捕获其它异常
13     print(e)
14 else:
15     print("没有异常会接着往下执行。。。")
16 finally:
17     print("最后一定执行。。。")
18
19 # 测试捕获某种或某些种except
20 try:
21     print(aaa)
22     print("--------------") # 出现异常后不会执行下面的程序
23 except NameError as e: # 捕获NameError类型异常
24     print(e)
25 except Exception as e: # 捕获其它异常
26     print(e)
27 else:
28     print("没有异常会接着往下执行。。。")
29 finally:
30     print("最后一定执行。。。")
31
32 # 测试捕获其它异常
33 try:
34     open("a.txt")
35     print("--------------")
36 except NameError as e: # 捕获NameError类型异常
37     print(e)
38 except Exception as e: # 捕获其它异常
39     print(e)
40 else:
41     print("没有异常会接着往下执行。。。")
42 finally:
43     print("最后一定执行。。。")
44
45 # 测试异常传递
46 def err():
47     print(aaa)
48
49 try:
50     print("===============")
51     err()
52 except NameError as e: # 捕获NameError类型异常
53     print(e)
54
55 print("use try will make your code beauty")

结果：