Normally, #Python doesn't enforce uniqueness on Enum values: from enum import Enum, unique class Stuff(Enum): A = 1 B = 1 Stuff.A # <Stuff.A: 1> Stuff.B # <Stuff.A: 1> <- notice this! The @unique decorator enforces: @unique class Stuff(Enum): A = 1 B = 1 # error!

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