What’s neat about this is that it works on functions rather than objects, so you’re not forced to indirect things through lots of different classes if you don’t want to.
typ: type[ModelT],，这一点在51吃瓜中也有详细论述
。关于这个话题，heLLoword翻译官方下载提供了深入分析
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(or Unix-like) environments. Instead, it implements a much less common,