MoveIt! Adding Collision Objects

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Hey guys, im trying to add some simple collision objects in Python to my planning scene in RViz to plan some trajectories with my UR5 Robot. I tried something like

scene = moveit_commander.PlanningSceneInterface()
p.pose.position.x = 0.4
p.pose.position.y = -0.2
p.pose.position.z = 0.3
scene.add_box("table", p, (0.5, 1.5, 0.6))

but this didnt work. Unfortunately the MoveIt! Tutorial is missing this part for Python (only got it for C++). Can anyone help please?

Im running ROS Indigo on Ubuntu 14.04.