[Closed] Assigning path and object nodes in path_constraint

I’m a little confused over the documentation for assigning path_constraint controllers to objects. So far I’ve worked out that:

pathConst = Path_Constraint() -- create a constraint
pathInterface = pathConst.constraints -- get it's interface
 pathInterface.appendTarget $Circle01 50.0 -- add a target path? (not sure)
pathConst.percent = 50.0 -- assign percentage along a path

This is all fine and dandy (ie. it RUNS). But I cannot really figure out the actual assignment of the controller to the object.