TicTacToe.py

1#Tic tac toe in python

board=[' ' for  x in range(10)]


def insertLetter(letter,pos):
    board[pos]=letter

def spaceIsFree(pos):
    return board[pos]==' '

def printBoard(board):
    print('             |   |')
    print('           ' + board[1] + ' | ' + board[2] + ' | ' + board[3])
    print('             |   |')
    print('          -----------')
    print('             |   |')
    print('           ' + board[4] + ' | ' + board[5] + ' | ' + board[6])
    print('             |   |')
    print('          -----------')
    print('             |   |')
    print('           ' + board[7] + ' | ' + board[8] + ' | ' + board[9])
    print('             |   |')
    
def isWinner(bo, le):
    return (bo[1] == le and bo[2] == le and bo[3]==le) or (bo[4] == le and bo[5] == le and bo[6]==le) or (bo[7] == le and bo[8] == le and bo[9]==le) or(bo[1] == le and bo[4] == le and bo[7]==le) or(bo[2] == le and bo[5] == le and bo[8]==le) or(bo[3] == le and bo[6] == le and bo[9]==le) or(bo[1] == le and bo[5] == le and bo[9]==le) or(bo[3] == le and bo[5] == le and bo[7]==le)

def playerMove():
    run=True
    while run:
        move=input('Please select a position to place an \'X\' (1-9):')
        try:
            move=int(move)
            if move > 0 and move < 10:
                if spaceIsFree(move):
                    run=False
                    insertLetter('X',move)
                else:
                    print('Sorry, this space is occupied!')
            else:
                print('Please type a number within the range!')
        except:
            print('Please type a number!')

def compMove():
    possibleMoves=[x for x,letter in enumerate(board) if letter == ' ' and x!=0]
    move=0

    for let in ['O','X']:
        for i in possibleMoves:
            boardCopy= board[:]
            boardCopy[i]=let
            if isWinner(boardCopy, let):
                move=i
                return move

    cornersOpen= []
    for i in possibleMoves:
        if i in [1,3,7,9]:
            cornersOpen.append(i)

    if len(cornersOpen)>0:
        move = selectRandom(cornersOpen)
        return move

    if 5 in possibleMoves:
        move=5
        return move

    edgesOpen= []
    for i in possibleMoves:
        if i in [2,4,6,8]:
            edgesOpen.append(i)

    if len(edgesOpen)>0:
        move = selectRandom(edgesOpen)

    return move
    

def selectRandom(li):
    import random
    ln = len(li)
    r = random.randrange(0,ln)
    return li[r]

def isBoardFull(board):
    if board.count(' ') > 1:
        return False
    else:
        return True

def main():
    print('Welcome to tic tac toe!')
    printBoard(board)

    while not(isBoardFull(board)):
        if not(isWinner(board, 'O')):
            playerMove()
            printBoard(board)
        else:
            print('Sorry, O\'s won this time!')
            break
        
        if not(isWinner(board, 'X')):
            move=compMove()
            if move == 0:
                print('Tie Game')
            else:
                insertLetter('O',move)
                print('Computer placed an \'O\' in position',move)
                printBoard(board)
        else:
            print('Sorry, X\'s won this time!')
            break
        
    if isBoardFull(board):
        print('Tie Game!')

main()