Eli Bendersky added the comment:
Ethan, something is wrong with _StealthProperty. Well, two things. First, it's
way too general and can be cut to just what Enum needs. Second, this is enough
to make the tests pass:
class _StealthProperty():
"""
Returns the value in the instance, or the virtual attribute on the class.
A virtual attribute is one that is looked up by __getattr__, as opposed to
one that lives in __class__.__dict__
"""
def __init__(self, fget):
self.fget = fget
def __get__(self, obj, objtype=None):
return self.fget(obj)
def __set__(self, obj, value):
raise AttributeError("can't set attribute")
def __delete__(self, obj):
raise AttributeError("can't delete attribute")
Now this is fishy because __get__ gets obj=None when called on a class and
therefore self.fget(obj) raises an exception. But this gets caught somewhere in
your code or tests and ignored. However, the right thing is still returned. I
didn't have more time to investigate, but this must be cleaned out.
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<http://bugs.python.org/issue17947>
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