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Re: Exception Messages

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On 10/15/2012 12:34 PM, MRAB wrote:
> On 2012-10-15 17:22, John Gordon wrote:
>> In <mailman.2217.1350317845.27098.python-list@python.org> MRAB
>> <python@mrabarnett.plus.com> writes:
>>
>>> > Why wasn't the message printed out?
>>>
>>> You didn't add a __str__ method:
>>
>>> class PvCamError(Exception):
>>>      def __init__(self, msg):
>>>          self.msg = msg
>>>      def __str__(self):
>>>          return self.msg
>>
>> Wouldn't PvCamError inherit __str__() from Exception?
>>
> Yes, but you've put the message in msg, and Exception doesn't have that
> attribute.
>
> An alternative approach would be:
>
> class PvCamError(Exception):
>     pass
>

Wouldn't another approach be for this __init__() method to call the
base-class __init__() method with whatever data it needs?



-- 

DaveA

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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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