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后来引入 concurrent.futures.ThreadPoolExecutor，速度上来了，但是问题也跟着来了：并发太高容易被封 IP，请求频率完全不可控。 为了"温和爬取"，我不得不在每次请求之间加 time.sleep ()，可是一旦某个线程挂了，剩下的线程照样在跑，整个节奏就乱了。
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