the getplayermove(function asks the player to enter the number for the space they want to move on the loop makes sure the execution does not continue until the player has entered an integer from to it also checks that the space entered isn' already takengiven the tic tac toe board passed to the function for the board parameter the two lines of code inside the while loop simply ask the player to enter number from to the condition on line is true if either of the expressions on the left or right side of the or operator is true the expression on the left side checks if the player' move is equal to ' '' '' 'and so on up to ' by creating list with these strings (with the split(methodand checking if move is in this list ' split(evaluates to [' '' '' '' '' '' '' '' '' ']but the former easier to type the expression on the right side checks if the move that the player entered is free space on the board it checks this by calling the isspacefree(function remember that isspacefree(will return true if the move you pass is available on the board note that isspacefree(expects an integer for moveso the int(function returns an integer form of move the not operators are added to both sides so that the condition is true when either of these requirements are unfulfilled this will cause the loop to ask the player again and again until they enter proper move finallyline returns the integer form of whatever move the player entered remember that input(returns stringsso the int(function is called to return an integer form of the string short-circuit evaluation you may have noticed there' possible problem in the getplayermove(function what if the player typed in 'zor some other non-integer stringthe expression move not in ' split(on the left side of or would return false as expectedand then python would evaluate the expression on the right side of the or operator but calling int(' 'would cause an error python gives this error because the int(function can only take strings of number characterslike ' or ' 'not strings like 'zas an example of this kind of errortry entering this into the interactive shellint(' ' int(' 'traceback (most recent call last)post questions to