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

[Brandt Bucher]

Brandt Bucher <brandtbuc...@gmail.com> added the comment:

Caleb's answer, using PEP 584's merge operator:

    newenv = os.environ | {'FOO': ..., 'BAR': ...}
    subprocess.run(..., env=new_env, ...)

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nosy: +brandtbucher

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<https://bugs.python.org/issue39857>
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