This is the best one I have seen: "First Class Enums in Python"
http://code.activestate.com/recipes/413486/
It gives you a class, and the class contains all the enums. The enums can be compared to each other, but don't have any particular value; you can't use them as an integer value. (I resisted this at first because I am used to C enums, which are integer values. But if you can't use it as an integer, you can't use it as an integer by mistake so overall I think it is a win.) Each enum is a unique object. You can print enums, you can iterate over them, you can test that an enum value is "in" the enum. It's pretty complete and slick.
