How to use the graphviz._compat.stderr_write_bytes function in graphviz

if capture_output:
        kwargs['stdout'] = kwargs['stderr'] = subprocess.PIPE

    try:
        proc = subprocess.Popen(cmd, startupinfo=get_startupinfo(), **kwargs)
    except OSError as e:
        if e.errno == errno.ENOENT:
            raise ExecutableNotFound(cmd)
        else:
            raise

    out, err = proc.communicate(input)

    if not quiet and err:
        _compat.stderr_write_bytes(err, flush=True)

    if encoding is not None:
        if out is not None:
            out = out.decode(encoding)
        if err is not None:
            err = err.decode(encoding)

    if check and proc.returncode:
        raise CalledProcessError(proc.returncode, cmd,
                                 output=out, stderr=err)

    return out, err