newb: Creating Exception

[Dustan]

johnny wrote:
> 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.

You might want to get a book on python, rather than depend on the
documentation, which is, as you say, written for more experienced
programmers.

http://wiki.python.org/moin/IntroductoryBooks

I started with a book, and reading the tutorial now, am quite glad I
did. One thing that did bug me, at least briefly, is sometimes beginner
books don't explain what a line of code is actually doing - not
necessarily how it works, but as much information as is necessary to
actually be able to use the code shown.

> 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
> > 		HTTP://wlfraed.home.netcom.com/
> > 	(Bestiaria Support Staff:		web-asst at bestiaria.com)
> > 		HTTP://www.bestiaria.com/