Much like ImportError now has 'name' and 'path', AttributeError should get an 'attr' attribute that can only be set through a keyword argument or after creating an instance. That would make the common ``try/except AttributeError`` uses much more robust by not accidentally swallowing an AttributeError that has nothing to do with the attribute in question::

 try:
   cls.meth()
 except AttributeError as exc:
   if exc.attr != 'meth':
     raise