[issue39857] subprocess.run: add an extra_env kwarg to complement existing env kwarg

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

Ah, I didn't realize that os.environ and os.environ b aren't dict subclasses. I've added a ticket to update them with the new operators!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39857>
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