Extendent django choice. You can access by name like a dictionary

gistfile1.py

__author__ = 'dmitry'

class StatesCreator(object):
    def __init__(self, states_dict):
        self.states_dict = states_dict

    def for_choice(self):
        return tuple(zip(self.states_dict.values(), self.states_dict.keys()))

    def __getitem__(self, key):
        return self.states_dict[key]


SERVICE_STATES = StatesCreator(
    {
        'New': 0,
        'Approved': 1,
        'Declined': 2,
    }
)


print(SERVICE_STATES.for_choice())
print(SERVICE_STATES['Approved'])