scene=bpy.data.scenes["Scene"];
name="plane_00"
copyobj=bpy.data.objects["Cube"];
mesh = bpy.data.meshes.new(name)
ob_new = bpy.data.objects.new(name, mesh)
ob_new.data = copyobj.data.copy()
ob_new.scale = copyobj.scale
ob_new.location = copyobj.location
ob_new.location.x-=3;
scene.objects.link(ob_new)
ob_new.select = True