@Asai the variable f gives you information about the object which has been detected. Therefore you have to lower the thresshold enough to detect the object to be able to use it. You cannot get the score of objects which have a score lower than the thresshold.
@Aishkrish At the moment we only provide a URCAP to control the screwdriver. There are no python or ROS packages. This may eventually come in the future.