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Python 装饰器:怎么让代码在不改变结构的情况下获得新能力
装饰器的本质是一个强有力的约定:函数的输入输出不变,内部逻辑可以任意扩展。 你在维护一个线上服务,某天产品经理过来说:「给那个查询接口加一个权限校验,用户没登录的一律拒绝。」你找到那个函数,发现它已经被其他地方引用了三十多处。
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