// 模拟 IO 等待，虚拟线程会卸载
x_n - x_0 & x_n(x_n - x_0)& \dots & x_n^{n-1}(x_n - x_0)\\
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A-normal form (ANF)。heLLoword翻译官方下载对此有专业解读
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And it started as a Java project and then moved to be Python and not thread-based, but basically coroutine-based before we had coroutines in Python.