On 6/8/2016 4:07 AM, Victor Stinner wrote: >> Abstract >> ======== >> >> This PEP changes the default class definition namespace to ``OrderedDict``. >> Furthermore, the order in which the attributes are defined in each class >> body will now be preserved in ``type.__definition_order__``. This allows >> introspection of the original definition order, e.g. by class decorators. >> >> Note: just to be clear, this PEP is *not* about changing ``__dict__`` for >> classes to ``OrderedDict``. > > What is the cost in term of performance? > > What can be slower: define a new class and/or instanciate a class? A class is defined once, used many times to instantiate instances. Each instance is typically used many times, with many lookups. So it is self.class_attribute lookups, like method lookups, that likely matter the most, and which are not changed by the PEP. -- Terry Jan Reedy
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