the code at the start of the program just sets up some constant variables used in the game the width and height of the cells are stored in cellsize the assert statements on lines and ensure that the cells fit perfectly in the window for exampleif the cellsize was and the windowwidth or windowheight constants were set to then only cells could fit the assert statements make sure that only whole integer number of cells fits in the window white ( black red ( green darkgreen darkgray bgcolor black up 'up down 'down left 'left right 'right head syntactic sugarindex of the worm' head some more constants are set on lines to the head constant will be explained later in this the main(function def main() global fpsclockdisplaysurfbasicfont pygame init( fpsclock pygame time clock( displaysurf pygame display set_mode((windowwidthwindowheight) basicfont pygame font font('freesansbold ttf' pygame display set_caption('wormy' showstartscreen( while true rungame( showgameoverscreen(in the wormy game programwe've put the main part of the code in function called rungame(this is because we only want to show the --start screen|(the animation with the rotating --wormy|textonce when the program starts (by calling the showstartscreen(email questions to the authoral@inventwithpython com