In enum docs[0], there is a suggestion that the attribute access on members should raise an AttributeError:

>>> Color.red.blue
Traceback (most recent call last):
...
AttributeError: 'Color' object has no attribute 'blue'

which is demonstrably wrong in either 3.5 or 3.6. I presume that's a doc issue and I'd be glad to propose the patch as soon as someone more familiar with the module could confirm that.

[0] https://docs.python.org/3.6/library/enum.html#finer-points

Nope, that would be a bug.

Here is the test, it seems to have been 2545bfe0d273 that caused it (issue23486): test passes prior to it and fails on it (and I assume uniformly after).

Thanks for tracking that down.

After more research I'm inclined to leave the code as it is and revamp the docs to clarify that while it may work, the results may not be what you want:

-- 8< -------------------
class Color(Enum):
    red = 1
    blue = 2
    name = 3

print(Color.name)         # Color.name
print(Color.name.blue)    # Color.blue
print(Color.blue.name)    # 'blue'  (not Color.name!)
-- 8< -------------------

Patch attached.

No further comments re the latest patch.

Changed the wording slightly to indicate that looking up members on other members is a bad idea.

New changeset 276cf69b911e by Ethan Furman in branch '3.5':
Close issue25594: advise against accessing Enum members from other members
https://hg.python.org/cpython/rev/276cf69b911e

Other changeset f4b495ceab17 in default branch.