Adding Delay in Constraint Is it possible to add something like a delay to a constraint (e.g. Transform or Copy Loc / Rot) or to a driver?

For example, a driver should copy the rotation of a target which it had 10 frames ago. At the moment I'm using a scripted expression for copy rotation.

bpy.data.objects['Armature'].pose.bones['Bone'].rotation_euler.y


But this, of course, is only the rotation in the actual frame. I would not use any keyframes.
You can use a conditional if statement in the Driver expression which waits for a specific frame number before evaluating as true. 

So for example, here a Camera is tracking an object (Sphere-X) based on a Driver but I don't want this to kick in until frame 130 (until then I want the camera to stay at 200 on the x-axis):



Using the expression: 

var if frame&gt;130 else 200


Based on a ternary conditional operator:

valueIfTrue if isConditionTrue else valueIfFalse