How do I import and set files like .fbx .dxf .obj .skp to Grasshopper?

I wrote this python script inside Grasshopper which only import files to Rhino. After that I use a LunchBox component to save the same imported geometry by stating its name and after that I referenced the .3dm file to Grasshopper. The problem I have here is that I need to state the name of imported object every time. 
Would somebody please help me out with my python script? I want to get rid off all these process and end up with one python component which outputs the geometrics from whatever .fbx or .obj file. Or at least output the names of the imported geometries.