if mapobj[ ][yin ('$''*')'$is star stars append((xy)after creating the map objectthe nested for loops on lines and will go through each space to find the xy coordinates three things the player' starting position this will be stored in the startx and starty variableswhich will then be stored in the game state object later on line the starting position of all the stars these will be stored in the stars listwhich is later stored in the game state object on line the position of all the goals these will be stored in the goals listwhich is later stored in the level object on line rememberthe game state object contains all the things that can change this is why the player' position is stored in it (because the player can move aroundand why the stars are stored in it (because the stars can be pushed around by the playerbut the goals are stored in the level objectsince they will never move around basic level design sanity checks assert startx !none and starty !none'level % (around line %sin % is missing "@or "+to mark the start point (levelnum+ linenumfilename assert len(goals 'level % (around line %sin % must have at least one goal (levelnum+ linenumfilename assert len(stars>len(goals)'level % (around line %sin % is impossible to solve it has % goals but only % stars (levelnum+ linenumfilenamelen(goals)len(stars)at this pointthe level has been read in and processed to be sure that this level will work properlya few assertions must pass if any of the conditions for these assertions are falsethen python will produce an error (using the string from the assert statementsaying what is wrong with the level file the first assertion on line checks to make sure that there is player starting point listed somewhere on the map the second assertion on line checks to make sure there is at least one goal (or moresomewhere on the map and the third assertion on line checks to make sure that there is at least one star for each goal (but having more stars than goals is allowed create level object and starting game state object gamestateobj {'player'(startxstarty)'stepcounter'