[issue36395] Add deferred single-threaded/fake executor to concurrent.futures

[Brian Quinlan]

Brian Quinlan <brian at sweetapp.com> added the comment:

Hey Brian, why can't you use threads in your unit tests? Are you worried about non-determinism or resource usage? Could you make a ThreadPoolExecutor with a single worker?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36395>
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