So I am working on a ground surveillance robot using Arduino for coding the Gps, motors and ultrasonic sensors and coding in raspberry Pi for facial recognition but now what I want to do is when my robot has gotten to its final waypoint and has stopped it should excute the python file that does the facial recognition by calling it in the Arduino sketch but I don't know how to do it would be nice if someone could please help me out I appreciate your help in advance thank you