AmaniTicTacToe.py

# Global Variables

board = ['-','-','-',
	 '-','-','-',
         '-','-','-']


# Sets current player to X 
current_player = 'X'

# Global Variable to keep game going
gameStart = True

# Sets winner to none
winner = None



def show_board():
	# Displays board
	print('\n')
	print( board[0] + ' | ' + board[1] + ' | ' + board[2] + "    1 | 2 | 3 " ) 
	print( board[3] + ' | ' + board[4] + ' | ' + board[5] + "    4 | 5 | 6 " ) 
	print( board[6] + ' | ' + board[7] + ' | ' + board[8] + "    7 | 8 | 9 " )
	print('\n')

def player_input(player):
# Get position from player
  print(player + "'s turn.")
  position = input("Choose a position from 1-9: ")

  # Whatever the user inputs, make sure it is a valid input, and the spot is open
  valid = False
  while not valid:

    # Make sure the input is valid
    while position not in ["1", "2", "3", "4", "5", "6", "7", "8", "9"]:
      position = input("Choose a position from 1-9: ")
 
    # Get correct index in our board list
    position = int(position) - 1

    # Then also make sure the spot is available on the board
    if board[position] == "-":
      valid = True
    else:
      print("You can't go there. Go again.")

  # Put the game piece on the board
  board[position] = player

  # Show the game board
  show_board()


def game_over():
	# Function Checks for Winner or Tie
	checkWin()
	checkTie()
	


def checkWin():
  # Set global variables
  global winner
  # Check if there was a winner anywhere
  row_winner = check_rows()
  column_winner = check_columns()
  diagonal_winner = check_diagonals()
  # Get the winner
  if row_winner:
    winner = row_winner
  elif column_winner:
    winner = column_winner
  elif diagonal_winner:
    winner = diagonal_winner
  else:
    winner = None


# Check the rows for a win
def check_rows():
  # Set global variables
  global gameStart
  # Check if any of the rows have all the same value (and is not empty)
  row_1 = board[0] == board[1] == board[2] != "-"
  row_2 = board[3] == board[4] == board[5] != "-"
  row_3 = board[6] == board[7] == board[8] != "-"
  # If any row does have a match, flag that there is a win
  if row_1 or row_2 or row_3:
    gameStart = False
  # Return the winner
  if row_1:
    return board[0] 
  elif row_2:
    return board[3] 
  elif row_3:
    return board[6] 
  # Or return None if there was no winner
  else:
    return None


# Check the columns for a win
def check_columns():
  # Set global variables
  global gameStart
  # Check if any of the columns have all the same value (and is not empty)
  column_1 = board[0] == board[3] == board[6] != "-"
  column_2 = board[1] == board[4] == board[7] != "-"
  column_3 = board[2] == board[5] == board[8] != "-"
  # If any row does have a match, flag that there is a win
  if column_1 or column_2 or column_3:
    gameStart = False
  # Return the winner
  if column_1:
    return board[0] 
  elif column_2:
    return board[1] 
  elif column_3:
    return board[2] 
  # Or return None if there was no winner
  else:
    return None


# Check the diagonals for a win
def check_diagonals():
  # Set global variables
  global gameStart
  # Check if any of the columns have all the same value (and is not empty)
  diagonal_1 = board[0] == board[4] == board[8] != "-"
  diagonal_2 = board[2] == board[4] == board[6] != "-"
  # If any row does have a match, flag that there is a win
  if diagonal_1 or diagonal_2:
    gameStart = False
  # Return the winner
  if diagonal_1:
    return board[0] 
  elif diagonal_2:
    return board[2]
  # Or return None if there was no winner
  else:
    return None


# Check if there is a tie
def checkTie():
  # Set global variables
  global gameStart
  # If board is full
  if "-" not in board:
     gameStart= False
     return True
  # Else there is no tie
  else:
    return False

def switch_players():
	# Function Switch between current players
	global current_player

	if current_player == "X":
		current_player ='O'
	else: 
		current_player ='X'




# Play a game of tic tac toe
def start_game():
	# Show the initial game board
	show_board()
	
	# Loop until the game stops (winner or tie
	while gameStart:

		# Handle a turn
		player_input(current_player)

		# Check if the game is over
		game_over()

		# Which to next player
		switch_players()

	# Since the game is over, print the winner or tie
	if winner == "X" or winner == "O":
		print(winner + " won.")
	elif winner == None:
   	 	print("Tie.")




start_game()