> From: Eric Snow > Sent: Tuesday, June 07, 2016 2:52 PM > To: Émanuel Barry > Cc: Python-Dev > Subject: Re: [Python-Dev] PEP: Ordered Class Definition Namespace > > "dunder" names (not just methods) will not be present in > __definition_order__. I'll add an explanation to the PEP. The gist > of it is that they are reserved for use by the interpreter and will > always clutter up __definition_order__. Since needing dunder names > included in __definition_order__ would be rather exceptional, and > there are other options available, leaving them out by default is a > matter of practicality.
Good point. I'll assume that if we need that we'll do something in the metaclass. > What is the value of type.definition_order()? If you need a mutable > copy then pass __definition_order__ to list(). I think I explained it backwards. I meant to have a method on ``type`` (which metaclasses can override at will) which will set what is passed to the resulting __definition_order__ attribute. But it might not be needed, as we can probably sneak that inside the namespace in the metaclass' __new__. > > Additionally > > I'm not sure if setting the attribute to None is a good idea; I'd have it as > > an empty tuple. Then again I tend to overthink a lot. > > None indicates that there is no order. An empty tuple indicates that > there were no attributes. Fair enough. > > -eric -Emanuel _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
