[issue26266] add classattribute to enum to handle non-Enum attributes

[Ethan Furman]

Ethan Furman added the comment:

One possible downside to the `classattribute` route is that we have a descriptor whose only purpose is to shield the item from becoming a member; the up-side is that it's simple to implement.

Another possibility is `skip`:

class skip:
    """
    Protects item from becaming an Enum member during class creation.
    """
    def __init__(self, value):
        self.value = value

    def __get__(self, instance, ownerclass=None):
        return self.value

The advantage is that it is replaced by the metaclass with the stored value, so we have no extraneous descriptor after the Enum is created; the downside is that it requires change in the metaclass to do the right thing.

Thoughts?

----------
stage:  -> needs patch
type: behavior -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26266>
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