Yeah, cool. i am just starting this part. i am glad i started with python. thanks for the help sk
On Wed, 2005-10-26 at 21:32 -0700, w chun wrote: > > i am writing some (for me) pretty complicated stuff for work that > > really needs to work. > > i have looked at exception handling... > > and i am using some try / except statements. > > the problem is, that even though my script does not crash, i dont > > know > > the exact error. > > is there a parameter that will allow me to use try and except but > > that > > will also pring out the traceback statements that python usually does to > > the terminal? > > > exception handling is one of the greatest strengths of Python and > other high-level languages with this feature. it allows the > programmer to anticipate potential problems and perhaps be able to > accept and process them at runtime. > > let's say you have a code block called BLOCK. newbies to Python would > typically do something like this to ensure that errors don't happen: > > try: > BLOCK > except: > pass > > however, this is not the case. if errors *do* happen, they are thrown > away, thus serves no one any good, not the programmer nor the user. > > the best solution is to catch specific exceptions and handle each > case. (sure, and having just one handler for multiple exceptions is > also okay.). one example is hugo's where he catches an IOError > exception and uses the exception instance 'e' to get more info out of > it. > > now if you *don't* know what exceptions may happen, you can do > something similar. it's almost a combination of the above two > handlers: > > try: > BLOCK > except Exception, e: > print 'Caught exception without a specific handler:", e > > this will at least tell you what exception happens in BLOCK, so that > you can modify it to be something like: > > try: > BLOCK > except <YourSpecificException, e: > # handle YourSpecificException code > except Exception, e: > print 'Caught exception without a specfic handler:', e > > once you know the range of exceptions that may happen in BLOCK and > have written handlers for them, you can dispense with the general > catch-all. > > hope this helps! > -- wesley > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > "Core Python Programming", Prentice Hall, (c)2006,2001 > http://corepython.com > > wesley.j.chun :: wescpy-at-gmail.com > cyberweb.consulting : silicon valley, ca > http://cyberwebconsulting.com _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
