Re: Exception Messages

Newsgroups	comp.lang.python
Date	2012-10-15 10:44 -0700
References	(1 earlier) <mailman.2217.1350317845.27098.python-list@python.org> <k5hd7c$emf$1@reader1.panix.com> <mailman.2218.1350318893.27098.python-list@python.org> <96889d3a-1217-4743-93b5-f8dd5686eebd@googlegroups.com> <mailman.2226.1350322455.27098.python-list@python.org>
Subject	Re: Exception Messages
From	Wanderer <wanderer@dialup4less.com>
Message-ID	<mailman.2227.1350323056.27098.python-list@python.org> (permalink)

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On Monday, October 15, 2012 1:34:24 PM UTC-4, MRAB wrote:
> On 2012-10-15 18:18, Wanderer wrote:
> 
> > On Monday, October 15, 2012 12:34:53 PM UTC-4, MRAB wrote:
> 
> >
> 
> >>
> 
> >> Yes, but you've put the message in msg, and Exception doesn't have that
> 
> >>
> 
> >> attribute.
> 
> >>
> 
> >
> 
> > That's weird. I got this Exception class definition idea from this post by Guido van Rostrum, Where he gives this main function to look like
> 
> >
> 
> > import sys
> 
> > import getopt
> 
> >
> 
> > class Usage(Exception):
> 
> >      def __init__(self, msg):
> 
> >          self.msg = msg
> 
> >
> 
> > def main(argv=None):
> 
> >      if argv is None:
> 
> >          argv = sys.argv
> 
> >      try:
> 
> >          try:
> 
> >              opts, args = getopt.getopt(argv[1:], "h", ["help"])
> 
> >          except getopt.error, msg:
> 
> >               raise Usage(msg)
> 
> >          # more code, unchanged
> 
> >      except Usage, err:
> 
> >          print >>sys.stderr, err.msg
> 
> >          print >>sys.stderr, "for help use --help"
> 
> >          return 2
> 
> >
> 
> > if __name__ == "__main__":
> 
> >      sys.exit(main())
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > http://www.artima.com/weblogs/viewpost.jsp?thread=4829
> 
> >
> 
> >
> 
> Note how it explicitly prints err.msg.

Not in the raise statement. 

Adding the def __str__ made it work for me.
Thanks

Thread

Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 09:00 -0700
  Re: Exception Messages MRAB <python@mrabarnett.plus.com> - 2012-10-15 17:17 +0100
    Re: Exception Messages John Gordon <gordon@panix.com> - 2012-10-15 16:22 +0000
      Re: Exception Messages MRAB <python@mrabarnett.plus.com> - 2012-10-15 17:34 +0100
        Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:18 -0700
          Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:20 -0700
          Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:20 -0700
          Re: Exception Messages MRAB <python@mrabarnett.plus.com> - 2012-10-15 18:34 +0100
            Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:44 -0700
            Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:44 -0700
        Re: Exception Messages Wanderer <wanderer@dialup4less.com> - 2012-10-15 10:18 -0700
      Re: Exception Messages Dave Angel <d@davea.name> - 2012-10-15 12:42 -0400
      Re: Exception Messages Terry Reedy <tjreedy@udel.edu> - 2012-10-15 15:15 -0400
  Re: Exception Messages Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-10-16 00:47 +0000

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