docs: def CheckOutput(*popenargs, **kwargs):
    """
    Run command with arguments and return its output as a byte string.
    Backported from Python 2.7 as it's implemented as pure python on stdlib.
    """
    process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
    output, _ = process.communicate()
    retcode = process.poll()
    if retcode:
        cmd = kwargs.get("args")
        if cmd is None:
            cmd = popenargs[0]
        error = subprocess.CalledProcessError(retcode, cmd)
        error.output = output
        raise error
    return retcode, output