怎么用Python装饰器来缓存函数的返回值
本篇内容主要讲解"怎么用Python装饰器来缓存函数的返回值"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"怎么用Python装饰器来缓存函数的返回值"吧!
Python
class Memoized(object): ''' Descriptor for population statistical varibles caching. ''' def __init__(self, func): self.func = func self.result = None self.fitness = None def __get__(self, instance, cls): self.instance = instance return self def __call__(self, fitness): if ((not self.instance._updated) # population not changed and (self.result is not None) # result already cached and (fitness == self.fitness)): # fitness not changed # Return cached result directly. return self.result else: # Update fitness function. self.fitness = fitness # Update and memoize result. self.result = self.func(self.instance, fitness) # Recover flag. self.instance._updated = False return self.result |
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