bind_map generates KeysView, ItemsView & ListView, which causes Sphinx to crash

[TomSchammo]

I have a std::map<std::uint8_t, std::map<std::string, std::vector<float>>> full with values that I process using C++ and then expose in Python like this:

using map_alias = std::map<std::uint8_t, std::map<std::string, std::vector<float>>>;

PYBIND11_MAKE_OPAQUE(map_alias);
pybind11::bind_map<map_alias>(m, "CppMap");

This works fine but bind_map generates ItemsView[int, Dict[str, List[float]]], KeysView[int] & ValuesView[Dict[str, List[float]]] (as types that can then be returned by functions such as keys(). When I then try to generate documentation using sphinx, sphinx tries to import those views and crashes with AttributeErrors.

Now my understanding is that Sphinx is not supposed to try and import those, but it does it anyways because they are listed in dir(mymodule.submodule). (Though I'm not sure why exactly you can't import them if they are there, so that's something else I'm wondering about.)

Does anyone know how best to fix this?