creating tictactoe.py in separate folder

tictactoe_game/tictactoe.py

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+
+  # Tic Tac Toe
+
+   import random
+
+   def drawBoard(board):
+       # This function prints out the board that it was passed.
+
+       # "board" is a list of 10 strings representing the board (ignore index 0)
+       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('   |   |')
+
+     def inputPlayerLetter():
+         # Lets the player type which letter they want to be.
+         # Returns a list with the player’s letter as the first item, and the computer's letter as the second.
+         letter = ''
+         while not (letter == 'X' or letter == 'O'):
+             print('Do you want to be X or O?')
+             letter = input().upper()
+
+         # the first element in the list is the player’s letter, the second is the computer's letter.
+         if letter == 'X':
+             return ['X', 'O']
+         else:
+             return ['O', 'X']
+
+     def whoGoesFirst():
+         # Randomly choose the player who goes first.
+         if random.randint(0, 1) == 0:
+             return 'computer'
+         else:
+             return 'player'
+
+     def playAgain():
+         # This function returns True if the player wants to play again, otherwise it returns False.
+         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):
+         # Given a board and a player’s letter, this function returns True if that player has won.
+         # We use bo instead of board and le instead of letter so we don’t have to type as much.
+         return ((bo[7] == le and bo[8] == le and bo[9] == le) or # across the top
+         (bo[4] == le and bo[5] == le and bo[6] == le) or # across the middle
+         (bo[1] == le and bo[2] == le and bo[3] == le) or # across the bottom
+         (bo[7] == le and bo[4] == le and bo[1] == le) or # down the left side
+         (bo[8] == le and bo[5] == le and bo[2] == le) or # down the middle
+         (bo[9] == le and bo[6] == le and bo[3] == le) or # down the right side
+         (bo[7] == le and bo[5] == le and bo[3] == le) or # diagonal
+         (bo[9] == le and bo[5] == le and bo[1] == le)) # diagonal
+
+     def getBoardCopy(board):
+         # Make a duplicate of the board list and return it the duplicate.
+         dupeBoard = []
+
+         for i in board:
+             dupeBoard.append(i)
+
+         return dupeBoard
+
+     def isSpaceFree(board, move):
+         # Return true if the passed move is free on the passed board.
+         return board[move] == ' '
+
+     def getPlayerMove(board):
+         # Let the player type in their move.
+         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? (1-9)')
+             move = input()
+         return int(move)
+
+     def chooseRandomMoveFromList(board, movesList):
+         # Returns a valid move from the passed list on the passed board.
+         # Returns None if there is no valid move.
+         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):
+         # Given a board and the computer's letter, determine where to move and return that move.
+         if computerLetter == 'X':
+             playerLetter = 'O'
+         else:
+             playerLetter = 'X'
+
+         # Here is our algorithm for our Tic Tac Toe AI:
+         # First, check if we can win in the next move
+         for i in range(1, 10):
+             copy = getBoardCopy(board)
+             if isSpaceFree(copy, i):
+                 makeMove(copy, computerLetter, i)
+                 if isWinner(copy, computerLetter):
+                     return i
+
+         # Check if the player could win on their next move, and block them.
+         for i in range(1, 10):
+             copy = getBoardCopy(board)
+             if isSpaceFree(copy, i):
+                 makeMove(copy, playerLetter, i)
+                 if isWinner(copy, playerLetter):
+                     return i
+
+         # Try to take one of the corners, if they are free.
+         move = chooseRandomMoveFromList(board, [1, 3, 7, 9])
+         if move != None:
+             return move
+
+         # Try to take the center, if it is free.
+         if isSpaceFree(board, 5):
+             return 5
+
+         # Move on one of the sides.
+         return chooseRandomMoveFromList(board, [2, 4, 6, 8])
+
+     def isBoardFull(board):
+         # Return True if every space on the board has been taken. Otherwise return False.
+         for i in range(1, 10):
+             if isSpaceFree(board, i):
+                 return False
+         return True
+
+
+     print('Welcome to Tic Tac Toe!')
+
+     while True:
+         # Reset the board
+         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('Hooray! You have won the game!')
+                     gameIsPlaying = False
+                 else:
+                     if isBoardFull(theBoard):
+                         drawBoard(theBoard)
+                         print('The game is a tie!')
+                         break
+                     else:
+                         turn = 'computer'
+
+             else:
+                 # Computer’s turn.
+                 move = getComputerMove(theBoard, computerLetter)
+                 makeMove(theBoard, computerLetter, move)
+
+                 if isWinner(theBoard, computerLetter):
+                     drawBoard(theBoard)
+                     print('The computer has beaten you! You lose.')
+                     gameIsPlaying = False
+                 else:
+                     if isBoardFull(theBoard):
+                         drawBoard(theBoard)
+                         print('The game is a tie!')
+                         break
+                     else:
+                         turn = 'player'
+
+         if not playAgain():
+