django-enumfield

Instance based:

FooEnum = Enum('FooEnum',
    Item(10, 'a', "Item A"),
    Item(20, 'b', "Item B"),
)

Dynamically adding items:

FooEnum = Enum('FooEnum')
FooEnum.add_item(Item(10, 'a', "Item A"))
FooEnum.add_item(Item(20, 'b', "Item B"))

Simple registry pattern:

FooEnum = Enum('FooEnum')

class A(Item):
    __enum__ = FooEnum

    value = 10
    display = "Item A"

class B(Item):
    __enum__ = FooEnum

    value = 20
    display = "Item B"

Registry pattern with parent class:

FooEnum = Enum('FooEnum')

class FooEnumItem(Item):
    __enum__ = FooEnum

    def display_extended(self):
        return "%s (%s)" % (self.display, self.value)

class A(FooEnumItem):
    value = 10
    display = "Item A"

class B(FooEnumItem):
    value = 20
    display = "Item B"