* Michael Hudson <mwh@python.net> [2002-09-27 16:39 +0100]:
> On Fri, 27 Sep 2002, Gerhard Häring wrote:
>
> > This is somewhat off-topic, but I'm hoping maybe someone can give a hint
> > why this only happens on Python 2.2.1.
>
> Guessing, but the (Jeremy's?) changes I recently backported to
> classobject.c on the release22-maint branch might relate to this.
Maybe. I've not viewed the control flow in a debugger, but my tries to come up
with a minimalistic test case and my gut feeling says that this piece of code
has something to do with it:
static PyObject *PgLargeObject_getattr(PgLargeObject *self, char* attr)
{
PyObject *res;
res = Py_FindMethod(PgLargeObject_methods, (PyObject *)self, attr);
if (res != NULL)
return res;
PyErr_Clear();
if (strcmp(attr, "closed") == 0)
return Py_BuildValue("l", (long)(self->lo_fd == -1));
if (!strcmp(attr, "__module__"))
return Py_BuildValue("s", MODULE_NAME);
if (!strcmp(attr, "__class__")) {
printf("__class__ accessed!\n");
return Py_BuildValue("s", self->ob_type->tp_name);
}
return PyMember_Get((char *)self, PgLargeObject_members, attr);
}
from which I can see that isinstance tries to access the __class__ attribute.
Am I supposed to /not/ provide a __class__ attribute for classic types?
I haven't looked into the python22-maint changelogs yet, but I couldn't find
any related registered SF bug.
-- Gerhard
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