newb: Creating Exception

[johnny]

Thank you Dennis,
So when line 2, gets executed, its exception goes to do_some1_error.
And when line 3, gets executed, its exception goes to do_some2_error
and so on.

line 1:  try
line 2:    do_some1
line 3:    do_some2
line 4:    do_some3
line 5: except do_some1_error:
line 6:            whatever1
line 7: except do_some2_error:
line 8:            whatever2
line 9: except do_some3_error:
line 10:            whatever3

Documentation is not written for newbs, it's written by guys with 6yrs
of experience FOR guys with 6yrs of experience.

Dennis Lee Bieber wrote:
> On 11 Dec 2006 16:02:02 -0800, "johnny" <rampeters at gmail.com> declaimed
> the following in gmane.comp.python.general:
>
> > I want to print individual exception for database connection, sql
> > execution, database closing, closing the cursor.  Can I do it with one
> > try..catch or I need a nested try...catch?
>
> 	Python does not have a "catch" instruction.
>
> 	You could do:
>
> 	try:
> 		make connection	#though that should, in my mind, be done
> 							#as part of the initialization of the thread
> 							#and not as part of any processing loop
> 		make cursor
> 		execute sql
> 		fetch results if any
> 		close cursor
> 		commit transaction
> 		close connection	#which I'd make part of the termination
> 							#of the thread
> 	except Exception1, msg:
> 		do something
> 	except Exception2, msg:
> 		do something2
> 	...
>
> IF each step raises a different exception type -- if all the database
> returns is "DatabaseError", then there is nothing to separate them by.
> Also note that if an exception happens in the "execute sql" stage, your
> handler may need to do a rollback, and the closes.
>
> --
> 	Wulfraed	Dennis Lee Bieber		KD6MOG
> 	wlfraed at ix.netcom.com		wulfraed at bestiaria.com
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