example code for python exception

>>>>>> try:  
   raise Exception("a", "b")  
     except Exception,e:  
  print e  
     finally:  
  print "final"  
   
    
('a', 'b')('a', 'b')  
 final  
>>>>>>  

deal with muti exception 

 >>>>>> try:  
   raise EOFError("aa", "bb")  
     except RuntimeError, e:  
  print "[RuntimeErro]: ", e  
     except EOFError, e:  
  print "[EOFError]: ", e  
     except Exception, e:  
  print "[Error]: ", e  
     finally: 
 
 
[EOFError]:  ('aa', 'bb')  
 final  
>>>>>>   
 
 
 get error information using sys。
 
 
 
Code
 >>>>>> import sys  
 >>>>>> try:  
   raise RuntimeError("the runtime error raised")  
     except:  
  print sys.exc_info()  
   
    
(<type 'exceptions.RuntimeError'>, RuntimeError('the runtime error raised',), <traceback object at 0x00DC5CB0>)  
 >>>>>>    
   print "final" 
 

--
we drink green tea

python try-except example

try...except 

Python code  

1. tommy@lab3:~$ python  
2. Python 2.5.2 (r252:60911, Jan  4 2009, 17:40:26)  
3. [GCC 4.3.2] on linux2  
4. Type "help", "copyright", "credits" or "license" for more information.  
5. >>> 1/0  
6. Traceback (most recent call last):  
7.   File "<stdin>", line 1, in <module>  
8. ZeroDivisionError: integer division or modulo by zero  
9. >>>  
10. >>> try:  
11. ...     1/0  
12. ... except:  
13. ...     print "do something..."  
14. ...  
15. do something...  
16. >>>  

2. try...finally 

after code in try ，code in finally will run 

Python代码  

1. >>> try:  
2. ...     1/0  
3. ... finally:  
4. ...     print "I just finally do something ,eg: clear!"  
5. ...  
6. I just finally do something ,eg: clear!  
7. Traceback (most recent call last):  
8.   File "<stdin>", line 2, in <module>  
9. ZeroDivisionError: integer division or modulo by zero  
10. >>>  

 

Python code  

1. >>> try:  
2. ...     fd=open("have-exists-file", "r")  
3. ...     print "do some thing ,read file ,write file..."  
4. ... finally:  
5. ...     fd.close()  
6. ...  
7. do some thing ,read file ,write file...  
8. >>>  

--
we drink green tea