Module dependency in pybind11

Base.h

#pragma once

struct Foo {
};

CMakeLists.txt

cmake_minimum_required(VERSION 3.14)
project(test_1)

set(CMAKE_CXX_STANDARD 14)

add_subdirectory(external/pybind11)
pybind11_add_module(pyinterfaceBase pyinterfaceBase.cpp)
pybind11_add_module(pyinterfaceDependent pyinterfaceDependent.cpp)

pyinterfaceBase.cpp

#include <pybind11/pybind11.h>
#include "Base.h"

namespace py = pybind11;

const char * f(Foo &foo) { return "Base::f(Foo& foo)"; }

PYBIND11_MODULE(pyinterfaceBase, m) {

    py::class_<Foo>(m, "Foo")
            .def(py::init<>());

    m.def("f", f);
}

pyinterfaceDependent.cpp

#include <pybind11/pybind11.h>
#include "Base.h"

namespace py = pybind11;

const char *g(Foo &foo) { return "Dependent::g(Foo& foo)"; }

PYBIND11_MODULE(pyinterfaceDependent, m) {

    // next line is equivalent to python `import pyinterfaceBase; del pyinterfaceBase;`
    py::module base = py::module::import("pyinterfaceBase");

    // next line is equivalent to `from pyinterfaceBase import Foo as Goo`
    m.attr("Goo") =  base.attr("Foo");

    m.def("g", g);
}

test.py

import pyinterfaceDependent as m
from pyinterfaceDependent import Goo

print(m.g(Goo()))
help(m)

################################
# Output:
################################
#Dependent::g(Foo& foo)
#Help on module pyinterfaceDependent:
#
#NAME
#    pyinterfaceDependent
#
#FUNCTIONS
#    g(...) method of builtins.PyCapsule instance
#        g(arg0: pyinterfaceBase.Foo) -> str
#
#FILE
#    /home/sergei/CLionProjects/test_1/cmake-build-debug/pyinterfaceDependent.cpython-36m-x86_64-linux-gnu.so#
#