Python Distilled

Georg Brandl g.brandl-nospam at
Mon Nov 6 16:06:11 CET 2006

Paul McGuire wrote:
> "Marc 'BlackJack' Rintsch" <bj_666 at> wrote in message 
> news:pan.2006. at
>> In <1162790565.418382.237050 at>, Simon Wittber
>> wrote:
>>> I'd also like to remove any deprecated or stuff which is left in for
>>> backwards functionality (eg Classic classes).
>> Classic classes are still needed for exceptions:
>>>>> class E(object):
>> ...    pass
>> ...
>>>>> raise E
>> Traceback (most recent call last):
>>  File "<stdin>", line 1, in <module>
>> TypeError: exceptions must be classes, instances, or strings (deprecated),
>> not type
>> Ciao,
>> Marc 'BlackJack' Rintsch
> I thought exceptions were converted to new-style classes for Py2.5 
> (

Yes, they were. Still, you can't raise instance of arbitrary new-style classes
as exceptions, and you will never be able to. In Py3k, only instances of
"BaseException" subclasses will be raisable.


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