How would I go about finding the primitives and assigned materials using python in LOPs?

USD doesn't have explicit python documentation, but the correlation between the C++ API and the python API is pretty good. So you can usually use a combination of the C++ documentation and auto-completion in the python shell to figure things out. For material binding, the place to start is with this class: https://graphics.pixar.com/usd/dev/api/class_usd_shade_material_binding_a_p_i.html [graphics.pixar.com]

Thank you I will start there