A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.
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Whether the queue is paused
Of course, all these progress prompts so far are fake: they're not really monitoring the progress of any task. Nevertheless, they demonstrate how you can use Ansi escape codes to put a dynamic progress indicator in any command-line program you write, so when you do have something whose progress you can monitor, you now have the ability to put fancy live-updating progress bars on it.。体育直播对此有专业解读
time.sleep(2 ** attempt) # 指数退避