bpo-40275: test.support imports subprocess lazily by vstinner · Pull Request #20471 · python/cpython
test.support module now imports the platform and subprocess modules lazily to reduce the number of modules imported by "import test.support". With this change, the threading module is no longer imported indirectly by "import test.support". Use sys.version rather than platform.machine() to detect the Windows ARM32 buildbot.
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