[Python-Dev] 2.5 status

M.-A. Lemburg mal at egenix.com
Tue Sep 5 21:33:54 CEST 2006

Brett Cannon wrote:
> On 9/4/06, Neal Norwitz <nnorwitz at gmail.com> wrote:
>> There are 3 bugs currently listed in PEP 356 as blocking:
>>         http://python.org/sf/1551432 - __unicode__ breaks on exception
>> classes
> I replied on the bug report, but might as well comment here.
> The problem with this bug is that BaseException now defines a __unicode__()
> method in its PyMethodDef.  That intercepts the unicode() call on the class
> and it complains it was not handed an instance.  I guess the only way to
> fix this is to toss out the __unicode__() method and change the tp_str function
> to return Unicode as needed (unless someone else has a better idea).  Or
> the bug can be closed as Won't Fix.

The proper fix would be to introduce a tp_unicode slot and let
this decide what to do, ie. call .__unicode__() methods on instances
and use the .__name__ on classes.

I think this would be the right way to go for Python 2.6. For
Python 2.5, just dropping this .__unicode__ method on exceptions
is probably the right thing to do.

The reason why the PyObject_Unicode() function tries to be smart
here is that we don't have a tp_unicode slot (to complement
tp_str). It's obvious that this is not perfect, but only a

Marc-Andre Lemburg

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