Python自定义异常及抛出异常

1 \"\"\"

2 ⾃定义异常 3 \"\"\"

4 class MyException(Exception): # 继承异常类 5 def __init__(self, name, reason): 6 self.name = name 7 self.reason = reason 8

9 from datetime import datetime10 try:

11 if str(datetime.now()) > \"2018\":

12 raise MyException(\"TimeoutException\", \"time is overtime...\")13 except MyException as e:14 print(e.name +\":\"+e.reason)15 16 \"\"\"

17 抛出异常18 \"\"\" 19 try:20 6/021 raise

22 except Exception as e:23 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except20 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：