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On 04/26/2013 02:41 PM, Guido van Rossum wrote:

I am still optimistic that we can come up with a rule that  
works well enough in practice (and the Zen rule to which I was  
referring was, of course, "practicality beats purity").

The rule I liked best is "ignore callables, descriptors, and anything with leading & trailing double underscores". Personally I'd modify that to simply "anything with two leading underscores" so you can have private variables. It seems Pythonic to me in that classes already treat all those things special. And if you want enums of any of those things you can instantiate & insert them by hand after the class definition.

Does that fail in an important way?

/arry