An example of the usage of property() as decorator.

property_decorator.py

class Circle(object):
    def __init__(self, radius):
        self._radius = radius

    @property
    def radius(self):
        return self._radius
    @radius.setter
    def radius(self, value):
        self._radius = value
    @radius.deleter
    def radius(self):
        del self._radius