python @property

class parrot(object):
    def __init__(self):
        self._voltage = 10

    @property
    def voltage(self):
        return self._voltage

    @voltage.setter
    def voltage(self, new_value):
        self._voltage = new_value;

if __name__ == "__main__":
    p = parrot()
    print p.voltage
    p.voltage = 12
    print p.voltage