[issue34616] implement "Async exec"

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

> Yes, Elvis and I will take care of that later.

And I'm guessing you will collect what's in NEWS.d ? Otherwise I'm happy to contribute some text. let me know the best way.

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<https://bugs.python.org/issue34616>
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