note that even though the largest index of thelist would be in our examplethelist[ : won' raise an indexerror error even though is larger than it will just create list slice with the remaining items in the list list slicing doesn' destroy or change the original list stored in thelist it just copies portion of it to evaluate to new list value this new list value is the list that is appended to the list in the result variable on line so when we return result at the end of this functionwe are returning list of lists different coordinate systems def lefttopcoordsofbox(boxxboxy) convert board coordinates to pixel coordinates left boxx (boxsize gapsizexmargin top boxy (boxsize gapsizeymargin return (lefttopyou should be familiar with cartesian coordinate systems (if you' like refresher on this topicread coordinate systems one system of coordinates that is used in the memory puzzle game is for the pixel or screen coordinates but we will also be using another coordinate system for the boxes this is because it will be easier to use ( to refer to the th box from the left and rd from the top (remember that the numbers start with not instead of using the pixel coordinate of the box' top left corner( howeverwe need way to translate between these two coordinate systems here' picture of the game and the two different coordinate systems remember that the window is pixels wide and pixels tallso ( is the bottom right corner (because the top left corner' pixel is ( )and not ( )