replacing built-in exception types

[Calvin Spealman]

Why would you do this? How to do it, if its even possible, is far  
less important than if you should even attempt it in the first place.

On Dec 11, 2007, at 3:51 PM, Nishkar Grover wrote:

>
> I'm trying to replace a built-in exception type and here's a  
> simplified
> example of what I was hoping to do...
>
>>>>
>>>> import exceptions, __builtin__
>>>>
>>>> zeroDivisionError = exceptions.ZeroDivisionError
>>>>
>>>> class Foo(zeroDivisionError):
> ...     bar = 'bar'
> ...
>>>>
>>>> exceptions.ZeroDivisionError = Foo
>>>> ZeroDivisionError = Foo
>>>> __builtin__.ZeroDivisionError = Foo
>>>>
>>>> try:
> ...     raise ZeroDivisionError
> ... except ZeroDivisionError, e:
> ...     print e.bar
> ...
> bar
>>>>
>>>> try:
> ...     1/0
> ... except ZeroDivisionError, e:
> ...     print e.bar
> ...
> Traceback (most recent call last):
>    File "<stdin>", line 2, in ?
> ZeroDivisionError: integer division or modulo by zero
>>>>
>
> Notice that I get my customized exception type when I explicitly raise
> ZeroDivisionError but not when that is implicitly raised by 1/0. It
> seems like I have to replace that exception type at some lower level,
> but I'm not sure how/where. Does anyone know of a way to do this?
>
> - Nishkar
>
> -- 
> http://mail.python.org/mailman/listinfo/python-list