c++ call python function with array or list type return, convert it to cv::Mat

[Arrebol2020]

Hi, if i have a python function:

def list_return():
    a = np.zeros((2, 3))
    b = np.zeros((2, 5))
    return dict("a": a, "b": b)  # a.tolist(), b.tolist()
    #return a, b   # or a.tolist(), b.tolist()

and in cpp:

py::scoped_interpreter python;
py::module test = py::module::import("testFunc");

py::object result;

try {
    result = test.attr("list_return");
}
catch (exception& e) {
    cout << "call python transpose failed:" << e.what() << endl;
}

how can i get the result a and b, and convert them to cv::Mat