"""
Tic Tac Toe
A classic Python game of X's and O's.
"""
import random
# Function that will draw the game's board
def makeBoard(board):
print(end = '\n')
print(' | | ')
print(' ' + board[7] + ' ' + ' | ' + ' ' + board[8] + ' ' + ' | ' + ' ' + board[9] + ' ')
print(' | | ')
print('--------------------------')
print(' | | ')
print(' ' + board[4] + ' ' + ' | ' + ' ' + board[5] + ' ' + ' | ' + ' ' + board[6] + ' ')
print(' | | ')
print('--------------------------')
print(' | | ')
print(' ' + board[1] + ' ' + ' | ' + ' ' + board[2] + ' ' + ' | ' + ' ' + board[3] + ' ')
print(' | | ')
print(end = '\n')
# Function that prompts user to choose between "X" or "O"
def promptPlayerLetter():
letter = ''
while not (letter == 'X' or letter == 'O'):
letter = input('Choose between X or 0: ').upper()
# The first element in the list returned is the player's letter while the other one is for the computer
if letter == 'X':
return ['X', 'O']
else:
return ['O', 'X']
# Function that determines who will make the first move
def makeFirstMove():
if random.randint(0, 1) == 0:
return 'Computer'
else:
return 'Player'
# Function that prompts player(user) to play again. Return True if yes, otherwise False
def replayGame():
return input('Do you want to play again (y/n): ').lower().startswith('y')
# Function that simulates the game by generating the game board, process the letter chosen by the user, and the move to be made by either the player(user) or the computer
def makeMove(board, letter, move):
board[move] = letter
# Function that determines whether the player(user) has won the game
def winGame(board, letter):
# 1. Across the top
# 2. Across the middled
# 3. Across the bottom
# 4. Down the left side
# 5. Down the middle
# 6. Down the right side
# 7. Diagonal (1)
# 8. Diagonal (2)
return ((board[7] == letter and board[8] == letter and board[9] == letter) or (board[4] == letter and board[5] == letter and board[6] == letter) or (board[1] == letter and board[2] == letter and board[3] == letter) or (board[7] == letter and board[4] == letter and board[1] == letter) or (board[8] == letter and board[5] == letter and board[2] == letter) or (board[9] == letter and board[6] == letter and board[3] == letter) or (board[7] == letter and board[5] == letter and board[3] == letter) or (board[9] == letter and board[5] == letter and board[1] == letter))
# Function that duplicates the board after either the player(user) or the computer's turn
def copyBoard(board):
duplicateBoard = []
for x in board:
duplicateBoard.append(x)
return duplicateBoard
# Function that determines if the game board still has free blocks for any moves
def freeSpace(board, move):
return board[move] == ' '
# Function that prompts the player(user) to make a move and that move is simulated
def playerMove(board):
move = ' '
while move not in '1 2 3 4 5 6 7 8 9'.split() or not freeSpace(board, int(move)):
move = input('Your move (1-9): ')
return int(move)
# Function that returns a valid move from the passed list on the game board or returns None if there is no more valid moves
def pickRandomMoveFromList(board, movesList):
possibleMoves = []
for i in movesList:
if freeSpace(board, i):
possibleMoves.append(i)
if len(possibleMoves) != 0:
return random.choice(possibleMoves)
else:
return None
# Function that automates the computer's move in the game board
def computerMove(board, compLetter):
if compLetter == 'X':
playerLetter == 'O'
else:
playerLetter == 'X'
# Algorithm of AI(Artificial Intelligence) for the game
# It's first job is to determine if the player(user) can win after the next move
for i in range(1, 10):
copy = copyBoard(board)
if freeSpace(copy, i):
makeMove(copy, playerLetter, i)
if winGame(copy, playerLetter):
return i
# Try to make a move from one of the corners(1, 3, 7, 9), if they are free
move = pickRandomMoveFromList(board, [1, 3, 7, 9])
if move != None:
return move
# Try to take the center(5), if its free
if freeSpace(board, 5):
return 5
# Make a move on one of the board's sides(2, 4, 6, 8)
return pickRandomMoveFromList(board, [2, 4, 6, 8])
# Function that returns True if the space on the board has been taken. Otherwise return False
def boardFull(board):
for x in range(1, 10):
if freeSpace(board, x):
return False
return True
# Program Execution [Start Here]
while True:
# Reset the board
gameBoard = [' '] * 10
playerLetter, compLetter = promptPlayerLetter()
turn = makeFirstMove()
print('The ' + turn + ' will go first')
gameCommence = True
while gameCommence:
# Player's Turn
if turn == 'Player':
makeBoard(gameBoard)
move = playerMove(gameBoard)
makeMove(gameBoard, playerLetter, move)
if winGame(gameBoard, playerLetter):
makeBoard(gameBoard)
print('Congratulations! You won the game!')
gameCommence == False
else:
if boardFull(gameBoard):
makeBoard(gameBoard)
print('The game is a tie!')
break
else:
turn = 'Computer'
# Computer's Turn
else:
move = computerMove(gameBoard, compLetter)
makeMove(gameBoard, compLetter, move)
if winGame(gameBoard, compLetter):
makeBoard(gameBoard)
print('You Lose! The Computer has beaten you.')
gameCommence = False
else:
if boardFull(gameBoard):
makeBoard(gameBoard)
print('The game is a tie!')
break
else:
turn = 'Player'
if not replayGame():
break
This is a classic Tic Tac Toe developed in Python
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