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#!/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
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