setting up the window and data structures starting at line the code sets up some variables that track the movement of the bouncer set up movement variables moveleft false moveright false moveup false movedown false the four variables have boolean values to keep track of which of the arrow keys are being held down for examplewhen the user pushes the left arrow key on their keyboardmoveleft is set to true when they let go of the keymoveleft is set back to false lines to are identical to code in the previous pygame programs these lines handle the start of the game loop and what to do when the user quits the program we'll skip the explanation for this code here since we have already covered it in the last events and handling the keydown event the code to handle the key press and key release events start on line at the start of the programthey are all set to false if event type =keydownpygame has an event type called keydown this is one of the other events that pygame can generate brief list of the events that could be returned by pygame event get(is in table table - events and when they are generated