create choices in django using enums

enum_choices.py

"""
usage:

Event.objects.create(type=Event.TYPES.CHAT_ADDED)
"""

def enum(*sequential, **named):
    enums = dict(zip(sequential, range(len(sequential))), **named)
    reverse = dict((value, key) for key, value in enums.iteritems())
    enums['reverse_mapping'] = reverse
    return type('Enum', (), enums)


class Event(models.Model):

    event_types = (
        "CHAT_ADDED",
        "CHAT_CHANGED",
        "CHAT_REMOVED",
    )

    TYPES = enum(*event_types)

    TYPE_CHOICES = [(getattr(TYPES, x), TYPES.reverse_mapping[getattr(TYPES, x)]) for x in event_types]

    type = models.IntegerField(choices=TYPE_CHOICES)