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!

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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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