[Python-Dev] PEP 520: Ordered Class Definition Namespace

Victor Stinner victor.stinner at gmail.com
Wed Jun 8 04:07:27 EDT 2016

> 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?


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