Chris Rebert wrote: > There's no effect on attribute read-writes as they all take place > within the single __dict__ of the instance. As for method lookup, it > doesn't add an indirection per se, but rather the list of classes to > look thru to find a method gets longer, making base-class method > lookups slower. IIRC, a typical method lookup does something like the > following pseudocode: > > for klass in the_object.__mro__: > if method_name in klass.__dict__: > return klass.__dict__[method_name] > raise AttributeError # no such attribute
Your assumption is no longer true. Starting with Python 2.6 and 3.0 the lookup of attributes is cached. You can find detailed information by searching for VERSION_TAG in the source code. Christian -- http://mail.python.org/mailman/listinfo/python-list
