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Groups > comp.lang.python > #31329

Re: Exception Messages

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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.

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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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