目录1. backoff 库简介2. on_exception 装饰器的原理2.1 核心逻辑2.2 核心参数3. 常用退避策略3.1 指数退避（backoff.expo）3.2 固定间隔（backoff.constant）3.3 线性退避（backoff.linear）4. 使用方式与示例4.1 基
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