[docs] [issue27050] Demote run() below the high level APIs in subprocess docs

[Nick Coghlan]

Nick Coghlan added the comment:

Indeed, further discussion showed that what they were after was something more along the lines of sarge.Capture: http://sarge.readthedocs.io/en/latest/overview.html#main-features

That is, the ability to start the subprocess running in the background, and access the output line-by-line, but with the precise mechanics of how that works being a hidden implementation detail (just as concurrent.futures hides the details of the inter-process communication for function calls).

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