python异步请求：一开始写的代码是直接加了async，结果两个函数的请求仍是同步的，单个请求耗时0.3s，两个耗时0.7s。后经调研，发现，需要使用aiohttp请求，才可以实现真正的异步。优化后，总耗时0.4-0.5s左右。

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