On 19 Sep, 2013, at 12:12, Nick Coghlan <ncogh...@gmail.com> wrote: > > On 19 Sep 2013 20:00, "Paul Moore" <p.f.mo...@gmail.com> wrote: > > > > On 19 September 2013 10:32, Ronald Oussoren <ronaldousso...@mac.com> wrote: > > > The first time a method is called the bridge looks for an Objective-C > > > selector > > > with the same name and adds that to the class dictionary. This works fine > > > for normal > > > method lookups, by overriding __getattribute__, but causes problems with > > > super: > > > super happily ignores __getattribute__ and peeks in the class __dict__ > > > which may > > > not yet contain the name we're looking for and that can result in > > > incorrect results > > > (both incorrect AttributeErrors and totally incorrect results when the > > > name is > > > not yet present in the parent class' __dict__ but is in the grandparent's > > > __dict__). > > > > As an alternative approach, could you use a custom dict subclass as > > the class __dict__, and catch the peeking in the class __dict__ that > > way? Or is this one of those places where only a real dict will do? > > Even Python 3 doesn't let you control the *runtime* type of the class dict, > only the type used during evaluation of the class body.
Changing the class dict type from C is easy enough, but as you wrote below doing this gives you an interesting experience. Changing PyDict_* to call the subclass implementation of the corresponding slot would be easy enough, but that changes the behavior of a core CPython API and I wouldn't look forward to auditing the CPython code base to check if such a change is safe (let alone all other extensions). Some code will use the PyDict_* API instead of the abstract API because the former is faster, but at least some callers for PyDict_GetItem will do this to explicitly get the base class implementation. Ronald > > I've played with changing that - it makes for a rather special interpreter > experience :) > > Cheers, > Nick. > > > > > Paul _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
