An example that shows more or less how to use the property decorator in python.

Property.py

class Example(object):

    def __init__(self, x=None, y=None):
        self._x = x
        self._y = y

    @property
    def x(self):
        return self._x

    @x.setter
    def x(self, value):
        self._x = value

    @x.getter
    def x(self):
        return abs(self._x)

    @property
    def y(self):
        return self._y

    @y.setter
    def y(self, value):
        self._y = value