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享元模式是一种比较简单的设计模式，用的也比较多，他可以有效复用对象，在一定程度上提高程序的性能。我们常见的池化技术其实就是享元模式的一类实现。代码示例：
from abc import ABCMeta, abstractmethodclass FlyWeight(metaclass=ABCMeta):def __init__(self, extrinsic):self._extrinsic = extrinsic@propertydef extrinsic(self):return self._extrinsic@propertydef intrinsic(self):return self._intrinsic@intrinsic.setterdef intrinsic(self, value):self._intrinsic = value@abstractmethoddef oper(self):passclass ConcreteFlyWeight(FlyWeight):def oper(self):self.intrinsic = 'intrinsic attr'print('oper in concrete flyweight, intrinsic: {}, extrinsic: {}'.format(self.intrinsic, self.extrinsic))class FlyWeightFactory:_flyweights = {}def get_flyweight(self, extrinsic):return self._flyweights.setdefault(extrinsic, ConcreteFlyWeight(extrinsic))if __name__ == '__main__':fac = FlyWeightFactory()a = fac.get_flyweight('a')a.oper()
输出：
oper in concrete flyweight, intrinsic: intrinsic attr, extrinsic: a
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