[Tutor] error trap

[kirk Bailey]

OK, I am trying to handle it with a default except statement, and
capture the error feedback, but I get nothing but complaints when I
try THIS:

for to_addr in members :                # for each address in
'listnamemembers',
        # print "to_addr: ", to_addr
        # print "from_addr: ", from_addr
        # print "msg=" + CRLF, msg
        try:
                server.sendmail(from_addr, to_addr, msg)        # 400
send envlope and msg!
        except e:
                print "POSSIBLE Bad address='"+to_addr+"' ?"
                print "exception message:", e

So I removed the 'e' in the line 'except e:' and the second print
statement in the exception block.
This handles bad emails, so preserves function and continues delivery.
Still, I would love to see that error feedback if possible- maybe have
it email me with it.

Daniel Coughlin wrote:
> 
> On Fri, 18 Jan 2002, kirk Bailey wrote:
> 
> >
> >
> > Danny Yoo wrote:
> > >
> > > On Fri, 18 Jan 2002, kirk Bailey wrote:
> > >
> > > > ok, built a pretty blunt weapon to handle errors.
> > > >
> > > > IN TLpost.py;
> > > > for to_addr in members :                # for each address in
> > > > 'listnamemembers',
> > > >         # print "to_addr: ", to_addr
> > > >         # print "from_addr: ", from_addr
> > > >         # print "msg=" + CRLF, msg
> > > >         try:
> > > >                 server.sendmail(from_addr, to_addr, msg)        # 400 send envlope and msg!
> > > >         except:
> > > >                 print "Bad address='"+to_addr+"'"
> > >
> > > It might be good to also print out the error message that the system
> > > itself gives.  Every exception that gets thrown brings with it a useful
> > > error message for debugging purposes.  So:
> > >
> > > ###
> > > try:
> > >     server.sendmail(from_addr, to_addr, msg)
> > > except Exception, e:
> >          ^^^^^^^^^  ^ ??? more data please?
> > >     print "Bad address='"+to_addr+"'"
> > >     print "exception message:", e <-- this must be ther actual error reported?
> >
> > > ###
> > >
> > > is more informative, if a bit uglier.  Still, it'll help if anything weird
> > > happens.
> >
> > Should I install a wierdness magnet? Maybe a prayer wheel to obtain
> > blessings?
> >
> > To perdition with cosmetics, just help me understand it!
> > (we can pretty up the listing later...)
> >
> > > > Testing with a known bad address in the list, it comes up with an
> > > > error print, and finishes the job.
> > >
> > > The reason why we still want to print out the exception is as a worst-case
> > > thing: what if there were some other way to make server.sendmail() die
> > > other than a bad 'to_addr'?  There probably isn't a way, but let's make
> > > certain that, in the case that we've overlooked something, we'll still get
> > > useful information from the error.
> >
> > Sounds like a plan to me, just tell me a little more bout this
> > statement I threw carrots at.
> > (bad pun I know.)
> 
> The statement you threw carrots at:
> 
> 1. Exception is the base class for all exceptions. All Exceptions are built from
> this class.
> 
> 2. The variable e will be an instance of the Exception class. Adding this
> variable is optional to except statement.
> 
> 3. Depending on the exception, you may get more information about it by
> reviewing
> e.args.
> 
> 4. You can refine you exception by saying
> >>> except SpecificException, s
> such as IndexError or TypeError or you can define your own by extending the
> Exception class.
> 
> 5. And last! you can play in the interpreter like this:
> >>> try:
> >>>     l = [1]
> >>>     l[2]
> >>>except Exception, e:
> >>>     print e
> list out of range
> >>> l = [1]
> >>> l[2]
> >>>
> Traceback (most recent call last):
> ...
> IndexError: list out of range
> 
> Note that IndexError is a specific type of exception, derived from the Exception
> class.
> 
> and if this were one of the problems you might encounter in you code
> you coulde write
> >>> except IndexError, i:
>         whatever
> 
> in this way you can specify what way you want to handle specific exceptions.
> 
> hope this helps!
> 
> Daniel
> 
> _______________________________________________
> Tutor maillist  -  Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor

-- 
 

 -Respectfully,
              -Kirk D Bailey 
               Consulting Loose Cannon

end



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