def get_policy_json(self):
    '获取policy的json格式数据'
    if (not self.policy):
        return None
    data = self.policy.to_json()
    return data
获取policy的json格式数据
def get_policy_json(self):
    
    if (not self.policy):
        return None
    data = self.policy.to_json()
    return data