choice.py

class Choice(object):

    def __init__(self, *args):
        self._data = tuple([
            (value, value) if isinstance(value, str) else value
            for value in args
        ])
        self._data_dict = dict(self._data)

    def __iter__(self):
        return iter(self._data)

    def __getattr__(self, name):
        return self._data_dict.get(name)

YEAR_CHOICE = Choice(
    ('FR', 'Freshman'),
    'SO',
    'JR',
    ('SR', 'Senior'),
)

for x in YEAR_CHOICE:
    print x

print YEAR_CHOICE.FR
print YEAR_CHOICE.JR