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prologic - Python, pasted on Jan 20:
#!/usr/bin/env python

from math import pi

class CircleA(object):

    def __init__(self, radius):
        self._radius = radius
        self._area = pi * radius ** 2

    def __getRadius(self):
        return self._radius

    def __setRadius(self, radius):
        self._radius = radius
        self._area = pi * radius ** 2

    def __getArea(self):
        return self._area

    def __repr__(self):
        return "<Circle r=%0.2f A=%0.2f>" % (self.radius, self.area)

    radius = property(__getRadius, __setRadius)
    area = property(__getArea)

class CircleB(object):

    def __init__(self, radius):
        self.radius = radius
        self.area = pi * radius ** 2

    def setRadius(self, radius):
        self.radius = radius
        self.area = pi * radius ** 2

    def __repr__(self):
        return "<Circle r=%0.2f A=%0.2f>" % (self.radius, self.area)

a = CircleA(1.5)
print a
a.radius = 2.0
print a

b = CircleB(1.5)
print b
b.radius = 2.0
print b


Output:
1
2
3
4
<Circle r=1.50 A=7.07>
<Circle r=2.00 A=12.57>
<Circle r=1.50 A=7.07>
<Circle r=2.00 A=7.07>


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