Files
  • main.py
main.py
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import random

def drawBoard(board):
  #Prints the board
  
  print("   |   |")
  print(" " + board[7] + " | " + board[8] + " | " + board[9])
  print("   |   |")
  print("-----------")
  print(" " + board[4] + " | " + board[5] + " | " + board[6])
  print("   |   |")
  print("-----------")
  print("   |   |")
  print(" " + board[1] + " | " + board[2] + " | " + board[3])
  print("   |   |")
  
def inputPlayerLetter():
  letter = ""
  while not (letter == "X" or letter == "O"):
    print("Do you want to be X or O")
    letter = input().upper()
    
  if letter == "X":
    return ["X", "O"]
  else:
    return ["O", "X"]

def whoGoesFirst():
  if random.randint(0, 1) == 0:
    return "computer"
  else:
    return "player"
  
def playAgain():
  print("Do you want to play again? (yes or no)")
  return input().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)):
    print("What is your next move?")
    move = input()
  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 = "O"
  else:
    playerLetter = "X"
    
  #Tic Tac Toe AI
  #Can computer win?
  for i in range(1, 10):
    copy = getBoardCopy(board)
    if isSpaceFree(copy, i):
      makeMove(copy, computerLetter, i)
      if isWinner(copy, computerLetter):
        return i
      
  #Can player win?
  for i in range(1, 10):
    copy = getBoardCopy(board)
    if isSpaceFree(copy, i):
      makeMove(copy, playerLetter, i)
      if isWinner(copy, playerLetter):
        return i
  
  #Take one of the corners if they are free
  move = chooseRandomMoveFromList(board, [1, 3, 7, 9])
  if move != None:
    return move
  
  #Take the center if it is free
  if isSpaceFree(board, 5):
    return 5
  
  #Take the sides
  return chooseRandomMoveFromList(board, [2, 4, 6, 8])

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


#START OF GAME:

print("Welcome to Tic Tac Toe")

while True:
  
  theBoard = [" "] * 10
  playerLetter, computerLetter = inputPlayerLetter()
  turn = whoGoesFirst()
  print("The " + turn + " will go first")
  gameIsPlaying = True
  
  while gameIsPlaying:
    if turn == "player":
      #Player's Turn
      drawBoard(theBoard)
      move = getPlayerMove(theBoard)
      makeMove(theBoard, playerLetter, move)
      
      if isWinner(theBoard, playerLetter):
        drawBoard(theBoard)
        print("You have won!")
        gameIsPlaying = False
        
      else:
        if isBoardFull(theBoard):
          drawBoard(theBoard)
          print("The game has been tied")
          break
        else:
          turn = "computer"
    else:
      #Computer's Turn
      move = getComputerMove(theBoard, computerLetter)
      makeMove(theBoard, computerLetter, move)
      
      if isWinner(theBoard, computerLetter):
        drawBoard(theBoard)
        print("You lose!")
        gameIsPlaying = False
      else:
        if isBoardFull(theBoard):
          drawBoard(theBoard)
          print("The game has been tied")
          break
        else:
          turn = "player"
  if not playAgain():
    break
    
print("Thank you for playing!")
print("Made by Liam K - 2018")
print("My youtube: https://www.youtube.com/channel/UC_mXnbnROAsdQeonh8lwPeA")
print("tictactoe.py - Made in Codio")
input()          
      
Python 3.6.1 (default, Dec 2015, 13:05:11) [GCC 4.8.2] on linux