class MegaFunction(type):
    def __call__(cls, *args, **kwargs):
        return super(MegaFunction, cls).__call__(*args, **kwargs)()

class Elo(object):
    __metaclass__ = MegaFunction

    def __init__(self, arg1):
        self.arg1 = arg1

    def __call__(self):
        return self.arg1

print Elo, Elo('1')