Patch tango objects before they are processed by the metaclass.

def inheritance_patch(attrs):
    """Patch tango objects before they are processed by the metaclass."""
    for key, obj in attrs.items():
        if isinstance(obj, attribute):
            if getattr(obj, 'attr_write', None) == AttrWriteType.READ_WRITE:
                if not getattr(obj, 'fset', None):
                    method_name = obj.write_method_name or "write_" + key
                    obj.fset = attrs.get(method_name)