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The mess more reflects supporting a programmatic interface to processes in a cross platform manner, coupled with the actual complexity of parallel processing.

You didn’t mention the recommended high level option for subprocess, ‘subprocess. run’.

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Sure that exists too, but it blocks on process exit. I suppose I can run that in a separate thread but now I've got another dimension of complexity to deal with, and it's unclear if I can stream output from the subprocess?

There are other things I didn't mention that get thrown around too such as os.system() and os.fork().

For my use cases the asyncio wrapper makes it really easy to stack up a bunch of tasks, let the OS it’s thing, and then collect the results when they’re ready.

Other high-level languages do a better job with this.

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