access to blender header info: verts / faces / objects / mem


on top of the blender gui you have this header info with verts, faces, objects, mem, etc

is this info immediately accessible through the python api ?

i know len(bpy.context.scene.objects) gives the amount objects
and that we can calculate the amount of verts and faces
but maybe that info is accessible ‘precalculated’ through the api ?

what about the mem info ?

thanks and regards