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Date: Thu, 12 May 2011 13:40:44 -0700
From: Ethan Furman <ethan@stoneleaf.us>
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To: Andrew Berg <bahamutzero8825@gmail.com>
Subject: Re: Proper way to handle errors in a module
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Andrew Berg wrote:
> On 2011.05.12 02:25 PM, MRAB wrote:
>> You can raise an exception wherever you like! :-)
> If I raise an exception that isn't a built-in exception, I get something
> like "NameError: name 'HelloError' is not defined". I don't know how to
> define the exception.

class HelloError(Exception):
     "custom exception"

and that's all you need.  You can override __init__ to add your own 
attributes, etc, if you need to.

~Ethan~