python 规则执行

# *_*coding:utf-8 *_*
# @Author : zyb
class Rule:
    def __init__(self, condition, action):
        #初始化规则:两个函数，第一个函数成立返回True,执行第二个函数
        self.condition = condition
        self.action = action
    def evaluate(self, facts):
        #评估规则:param facts: 事实字典
        if self.condition(facts):
            self.action(facts)
class Agenda:
    def __init__(self):
        self.rules = []
    #添加规则到引擎 Rule 对象
    def add_rule(self, rule):
        self.rules.append(rule)
    def run(self, facts):
        """运行规则引擎:param facts: 事实字典"""
        for rule in self.rules:
            rule.evaluate(facts)

class Fact(dict):
    def __getattr__(self, name):
        return self.get(name,None)

if __name__ == '__main__':
    # 第一个判断函数
    def one_condition_one(facts):
        print('第一个判断函数：', facts)
        return False
    # 第一个执行函数
    def one_condition_two(facts):
        print('第一个执行函数:', facts)
    # 创建规则引擎
    engine = Agenda()
    # 添加规则
    engine.add_rule(Rule(one_condition_one, one_condition_two))
    y = Fact(x=6,y=7)
    x = {'x': 6, 'y': 7}
    # 运行规则引擎
    engine.run(y)
    engine.run(x)