practical1.py

import random

def drawBoard(board):
    print("   ")
    print(board[9]," | ",board[8]," | ",board[7])
    print("   ")
    print(".............")
    print("   ")
    print(board[6]," | ",board[5]," | ",board[4])
    print("   ")
    print(".............")
    print(board[3]," | ",board[2]," | ",board[1])
    print("   ")
    print(".............")

def inputPlayerLetter():
    letter = ""
    while not(letter == 'X' or letter == '0'):
        letter = input("Chose your symbol (0/X) : ").upper()
    if letter == 'X':
        return ["X","0"]
    else:
        return ["0","X"]

def whoGoesFirst():
    if random.randint(0,1) == 0:
        return 'computer'
    else:
        return 'player'

def playAgain():
    return input("Do you want to play again? (yes/no): ").lower().startswith('y')

def makeMove(board,letter,move):
    board[move] = letter

def isWinner(bo,le):
    return ((bo[7] == le and bo[8] == le and bo[9]== le) or
    (bo[4] == le and bo[5] == le and bo[6]== le) or
    (bo[1] == le and bo[2] == le and bo[3]== le) or
    (bo[7] == le and bo[4] == le and bo[1]== le) or
    (bo[8] == le and bo[5] == le and bo[2]== le) or
    (bo[9] == le and bo[6] == le and bo[3]== le) or
    (bo[7] == le and bo[5] == le and bo[3]== le) or
    (bo[9] == le and bo[5] == le and bo[1]== le) )

def getBoardCopy(board):
    dupeBoard = []
    for i in board:
        dupeBoard.append(i)
    return dupeBoard

def isSpaceFree(board,move):
    return board[move] == ''

def getPlayerMove(board):
    move = ''
    while move not in '1 2 3 4 5 6 7 8 9'.split() or not isSpaceFree(board,int(move)):
        move = input("What is your next move ? (1-9) : ")
    return int(move)

def chooseRandomMoveFromList(board,movesList):
    possibleMoves = []
    for i in movesList:
        if isSpaceFree(board,i):
            possibleMoves.append(i)
    if len(possibleMoves) != 0:
        return random.choice(possibleMoves)
    else:
        return None

def getComputerMove(board,computerLetter):
    if computerLetter == 'X':
        playerLetter == '0'
    else:
        playerLetter == 'X'

    for i in range(1,10):
        copy = getBoardCopy(board)
        if isSpaceFree(copy,i):
            makeMove(copy,computerLetter,i)
            if isWinner(copy,computerLetter):
                return i
    for i in range(1,10):
        copy = getBoardCopy(board)
        if isSpaceFree(copy,i):
            makeMove(copy,playerLetter,i)
            if isWinner(copy,playerLetter):
                return i
    move = chooseRandomMoveFromList(board,[1,3,7,9])
    if move != None:
        return move

    if isSpaceFree(board,5):
        return 5
    return chooseRandomMoveFromList(board,[2,4,6,8])

def isBoardFull(board):
    for i in range(1,10):
        if isSpaceFree(board,i):
            return False
    return True

print("............Welcome To TIC TAC TOE ..............")
while True:
    theBoard = ['']*10
    playerLetter,computerLetter = inputPlayerLetter()
    turn = whoGoesFirst()
    print(turn ," will go first")
    gameIsPlaying = True
    while gameIsPlaying:
        if turn == 'player':
            drawBoard(theBoard)
            move = getPlayerMove(theBoard)
            makeMove(theBoard,playerLetter,move)
            if isWinner(theBoard,playerLetter):
                drawBoard(theBoard)
                print("You won!!!")
                gameIsPlaying = False
            else:
                if isBoardFull(theBoard):
                    drawBoard(theBoard)
                    print('It is a tie')
                    break
                else:
                    turn = 'computer'
        else:
            move = getComputerMove(theBoard,computerLetter)
            makeMove(theBoard,computerLetter,move)
            if isWinner(theBoard,computerLetter):
                drawBoard(theBoard)
                print("Computer wins !!! You loose....")
                gameIsPlaying = False
            else:
                if isBoardFull(theBoard):
                    drawBoard(theBoard)
                    print('The game is Tie')
                    break
                else:
                    turn = 'player'
    if not playAgain():
        break