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Date: Thu, 12 May 2011 15:26:27 -0500
From: Tycho Andersen <tycho@tycho.ws>
To: Andrew Berg <bahamutzero8825@gmail.com>
Subject: Re: Proper way to handle errors in a module
References: <mailman.1415.1305134998.9059.python-list@python.org> <roy-FB35E1.14050911052011@news.panix.com> <4DCC318E.7020809@gmail.com> <4DCC3421.9070007@mrabarnett.plus.com> <4DCC3F37.3010904@gmail.com>
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On Thu, May 12, 2011 at 03:12:39PM -0500, 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.

You'll have to define it, as you would anything else (exceptions are
just regular "things"; in fact you can raise anything that's a class
or instance). I typically don't put a whole lot in my exception
classes, though.

point:~/working$ python
Python 2.6.2 (r262:71600, Jun  8 2009, 11:11:42) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class HelloError(Exception): pass
... 
>>> raise HelloError("hello!")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  __main__.HelloError: hello!

\t