[issue41517] Enum multiple inheritance loophole

[Tal Suhareanu]

New submission from Tal Suhareanu :

when inheriting an implemented enum, we get a runtime error
But when creating a multiple inheritance like the following, it works… so 
something feels broken in the enum mechanism


from enum import IntEnum, Enum

class A(IntEnum):
   a = 1

class B(A, Enum):
   b= 1

print(B.b)


--
components: Library (Lib)
messages: 375133
nosy: talsuk5
priority: normal
severity: normal
status: open
title: Enum multiple inheritance loophole
type: behavior
versions: Python 3.7

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[issue41517] Enum multiple inheritance loophole

[Tal Suhareanu]

Tal Suhareanu  added the comment:

Eric V. Smith it's in the first comment

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[issue41517] Enum multiple inheritance loophole

[Tal Suhareanu]

Tal Suhareanu  added the comment:

sorry, I'll explain. by "when inheriting an implemented enum, we get a runtime 
error" I refer to this 
https://docs.python.org/3/library/enum.html#restricted-enum-subclassing

You shouldn't be able to subclass an enum, yet I just showed a loophole. my 
example code shows you can subclass an enum by using a trick, multiple 
inheritance.

I hope it's more clear now :)

btw it also works with regular Enum inheritance (I just used IntEnum for 
simplicity)

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[issue41517] Enum multiple inheritance loophole

[Tal Suhareanu]

Tal Suhareanu  added the comment:

Ethan Furman bullseye! thanks for clarifying

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