异步 API 并不是在同步 API 外面包一层 asyncio 封装那么简单。从源码看，connect_async 直接调用 Rust 层的异步入口。在 python/python ...

上一篇《JavaScript篇 14》中，我们攻克了Promise——用链式调用替代回调地狱，让异步代码变得扁平化、可组合。但Promise链仍然是"回调"的思维方式：你必须在then中写下一步的操作。如果有一种方式，让异步代码看起来像同步代码一样"从上到下顺序执行"，会不会更好 ...

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