draft for django-enum

class Enum (tuple):
    __values = {}

    def __getattr__(self, attr):
        if attr in self.values.values():
            return 2**self.values.values().index(attr)
        else:
            raise Exception('called enum-object has no the attr called'
                            +' \"'+attr+'\" and has no the value named \"'+attr+'\"')

    def __getitem__(self, key):
        if key in self.values.keys():
            return self.values[key]
        else:
            return self.__getattr__(key)

    def __iter__(self):
        for item in self.values.items():
            yield item

    def __new__(cls, *iterable):                                                  # итератор двойных итераторов
        id=1

        for it in iterable:
            Enum.__values[id]=it
            id <<= 1

        return tuple.__new__(cls, Enum.__values.keys())

    def __init__(self, *keys):                                                   # итератор двойных итераторов
        self.values = Enum.__values.copy()
        Enum.__values = {}
        super(Enum, self).__init__(keys)

    def __str__(self):
        return super(Enum, self).__repr__()

    def __repr__(self):
        r = 0
        for i in self.values:
            r |= i
        return str(r)

def main():
    e = Enum('first','dfdf','rt')
    print e[1]
    print e

    print ''

    for i in e:
        print i

    print ''

    s = Enum('second')
    print s[1]
    print e['first']
    print e.first