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Now that I actually had the chance to play with the implementation, I see most of my worst fears were justified. :-( Look:
 >>> import enum
 >>> class B(enum.Flag):
 b = 3
 c = 4
 d = 6
 >>> B.b | B.c
 Traceback (most recent call last): ...
 ValueError: 7 is not a valid B
 >>> t = B.b | B.c
 >>> t
 <B.d|1: 7>
 >>> B.b | B.c
 >>> B.b | B.c
 <B.d|1: 7>
 >>> ~B.d
 <B.0: 0>
Do you really find this behavior acceptable?? I see at least three bugs here.
At least you did say in the documentation
> Individual flags should have values that are powers of two (1, 2, 4, 8, ...)
but it seems to me it's not prominent enough.
---
Also, auto, despite parentheses, works exactly as it shouldn't.
 >>> class C(enum.Enum):
	a = b = enum.auto()	
 >>> C.a
 <C.a: 1>
 >>> C.b
 <C.b: 2>
 >>> def f():
 return enum.auto()
 >>> class E(enum.Enum):
 a = b = f()
 c = d = 2
 >>> E.a is E.b
 False
 >>> E.c is E.d
 True
 >>> E.b is E.c
 True
In my opinion, this is simply horrible. Even _you_ said (http://bugs.python.org/issue23591#msg275093) this would be unacceptable. I'm really, really sad.