The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
def close(self) - None:
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expect. Just a year or two later, a now-forgotten company called Docutel was，推荐阅读Line官方版本下载获取更多信息
echo "started."，详情可参考heLLoword翻译官方下载