[issue34616] implement "Async exec"

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Here's a VERY rough first implementation to play with: https://github.com/1st1/cpython/commit/ad2ed0aed922d7c36f2fced64264124613e37f09

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34616>
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