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property
's tp_init
has this code:
if (Py_IS_TYPE(self, &PyProperty_Type)) {
Py_XSETREF(self->prop_doc, prop_doc);
} else {
/* If this is a property subclass, put __doc__
in dict of the subclass instance instead,
otherwise it gets shadowed by __doc__ in the
class's dict. */
/*...*/
PyObject_SetAttr((PyObject *)self, &_Py_ID(__doc__), prop_doc);
/*...*/
}
This assumes that subclasses of property
have a __dict__
(or a __doc__
attribute settable by other means). That is the case when subclassed using the class
statement, but might not be true using C.
A C-API reproducer is at https://github.com/wjakob/inheritance_issue/blob/master/inheritance_issue.c
I don't see a good way to fix this. We could:
- document that subclasses need to set
Py_TPFLAGS_MANAGED_DICT
(or provide a__doc__
descriptor), or - ignore the
AttributeError
, unless__doc__
was set explicitly?
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only security fixesonly security fixesAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error