[issue24254] Make class definition namespace ordered by default

[Ethan Furman]

Ethan Furman added the comment:

Not having a __definition_order__ could be a disadvantage for classes making use of __getattr__ for virtual attributes, such as Enum and proxy classes.

With __definition_order__, and __dir__, Enum could present a coherent view; without it it's a big jumbled mess with many attributes the user never wrote.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24254>
_______________________________________