A simple tic tac toe game for 2. Easily run it in your terminal and begin!

ifeLawalRecurseTicTacToePython.py

import random, numpy as np, sys

trueFalseArr = [True, False] # used for randomly choosing who goes first

# Return tuple of (winner or '' string if no winner, bool value for if game is tied)
def checkGameState(board):
    gameIsNotTied = True
    winner = ''

    # check horizontal wins
    for x in range(len(board)):
        if(board[x][0] != '_' and all(marker == board[x][0] for marker in board[x])):
            print('Horizontal win')
            winner = board[x][0]
            return winner, gameIsNotTied
    
 
    numpy_array = np.array(board) # store board in a numpy array
    transpose = numpy_array.T # transpose 2Dimensional array so the vertical matches are in a horizontal array layout
    # check vertical wins
    for x in range(len(transpose)):
        if(transpose[x][0] != '_' and all(marker == transpose[x][0] for marker in transpose[x])):
            print('Vertical win')
            winner = transpose[x][0]
            return winner, gameIsNotTied

    # check diagonal wins
    if(board[0][0] != '_' and board[0][0] == board[1][1] and board[1][1] == board[2][2]):
        print('Diagonal win')
        winner = board[0][0]
        return winner, gameIsNotTied

    if(board[0][2] != '_' and board[0][2] == board[1][1] and board[1][1] == board[2][0]):
        print('Diagonal win')
        winner = board[0][2]
        return winner, gameIsNotTied
    
    # check for gameTied
    for x in range(len(board)):
        if(any(marker == '_' for marker in board[x])): # if there are any _ markers the game isNotTied
            return winner, gameIsNotTied
    
    return winner, not(gameIsNotTied)

# Create initial 2D board
def createBoard():
    twoDimensionalBoard = [['_','_','_'],['_','_','_'],['_','_','_']]
    return twoDimensionalBoard

# Ask if they want a player vs player game or player vs npc game and check if
# the input is a Y or N
def requestUserGameChoiceAndCheckIfValid():
    userMove = "failure"
    print("Would you like to have two players? y to have two players, n to play against NPC")
    for x in range(0, 4):  # try 4 times
            try:
                userMove = raw_input('--> ').lower()
            except (AttributeError), e:
                if(x == 2): 
                    print("1 more chance to choose y to have two players or n to play against NPC")
                elif (x < 3): 
                    print("Please only enter either a y or n value")
                continue
            if userMove != "y" and userMove != "n":
                if(x == 2):
                    print("1 more chance to choose y to have two players or n to play against an NPC")
                elif (x < 3):
                    print("Please only enter either a y or n value")
            else:
                if(userMove == "y"):
                    print("You are playing with two players")
                else:
                    print("You are playing with npc")
                break
    if(userMove != "y" and userMove != "n"):
        print("Too many invalid inputs!")
        sys.exit()
    
    return userMove.upper()

# Request user input and check if it's an integer between 0 and 2
def requestUserMoveAndCheckIfValid():
    userMove = 'failure'
    for x in range(0, 4):  # try 4 times
            try:
                userMove = int(raw_input())
            except (NameError, SyntaxError, ZeroDivisionError, ValueError), e:
                if(x == 2 and x < 3): 
                    print("1 more chance for a valid number between 0 and 2")
                elif (x < 3): 
                    print('Please enter an integer')
                continue
            if userMove > 2 or userMove < 0:
                if(x == 2 and x < 3): 
                    print("1 more chance for a valid number between 0 and 2")
                elif (x < 3): 
                    print('Please enter an integer between 0 and 2')
            else:
                break

    return userMove

# Print 2D board to terminal
def printBoard(board):
    for x in range(len(board)):
        print(board[x])

# A two player game of tic tac toe
def playerVsPlayerGame(ticTacToeBoard):
    winner = ''
    gameIsNotTied = True

    # randomize who starts first
    playerXTurn = random.choice(trueFalseArr)

    # run the game
    while(gameIsNotTied and winner == ''):
        # check for keyboard interrupt to stop the game
        try:

            # notify players of whose turn it is
            if(playerXTurn):
                print("It's player 1 (X's) turn!")
            else:
                print("It's player 2 (O's) turn!")

            # take user input to place a marker on the board
            print("To place your marker, choose your row")
            rowInput = requestUserMoveAndCheckIfValid()
            if(rowInput == "failure"):
                raise KeyboardInterrupt
            print("Choose your column")
            columnInput = requestUserMoveAndCheckIfValid()
            if(columnInput == "failure"):
                raise KeyboardInterrupt
            print(rowInput, columnInput)
            if(ticTacToeBoard[rowInput][columnInput] != "_"):
                print("That position already has a value, that means:")
                continue
            else:
                ticTacToeBoard[rowInput][columnInput] = "X" if playerXTurn else "O"
                printBoard(ticTacToeBoard)
                winner, gameIsTied = checkGameState(ticTacToeBoard)
            
            # if no winner swap turns
            if(winner == '' and gameIsNotTied):
                playerXTurn = not(playerXTurn)
            elif(not(gameIsNotTied)):
                print("This game was tied! Well done to both players!")
            else:
                playerWon = 'Player 1 (X)' if playerXTurn else 'Player 2 (O)'
                print("Player %s won this game. \nThanks for playing!" % (playerWon))
            
        except KeyboardInterrupt:
            print("\nThanks for checking out Tic Tac Toe in Python!")
            break

# A game with a human player vs NPC
def playerVsNPCGame(ticTacToeBoard):
    print("Game type to come!")
    sys.exit()


# Play through a tic tac toe game
def playGame():

    # welcome players
    print("Welcome to Tic Tac Toe in Python. \nHere is the board!")

    # create and print board in terminal
    ticTacToeBoard = createBoard()
    printBoard(ticTacToeBoard)
    
    playerVPlayer = True if "Y" == requestUserGameChoiceAndCheckIfValid() else False
    
    if(playerVPlayer):
        playerVsPlayerGame(ticTacToeBoard)
    else:
        playerVsNPCGame(ticTacToeBoard)

# Play a game a game of Tic Tac Toe
playGame()