tictactoe.py

board =[" "for i in range(9)]

def print_board():
    row1 = '|{}|{}|{}|'.format(board[0],board[1],board[2]) 
    row2 = '|{}|{}|{}|'.format(board[3],board[4],board[5]) 
    row3 = '|{}|{}|{}|'.format(board[6],board[7],board[8])

    print()
    print(row1)
    print(row2)
    print(row3)
    print()


def player_move(icon):
    if  icon == "X":
        number = 1
    elif icon == 'O':
        number = 2
    print('Your turn player {}'.format(number))
    
    choice = int(input('enter your move (1-9)').strip())
    if board[choice-1] == " ":    # if user type the same number 
        board[choice-1] = icon
    else:
        print()      
        print( '  That space is taken  ')
        
def is_victory(icon):        
    if(board[0]== icon and board[1]==icon and board[2]==icon) or\
      (board[3]== icon and board[4]==icon and board[5]==icon) or\
      (board[6]== icon and board[7]==icon and board[8]==icon) or\
      (board[0]== icon and board[3]==icon and board[6]==icon) or\
      (board[1]== icon and board[4]==icon and board[7]==icon) or\
      (board[2]== icon and board[5]==icon and board[8]==icon) or\
      (board[0]== icon and board[4]==icon and board[8]==icon) or\
      (board[2]== icon and board[4]==icon and board[6]==icon):
        return True
    else:
        return False


def is_draw():
    if ' ' not in board:
        return True
    else:
        return False
        
def game_start(): # game loop- running forever
    print_board()
    player_move('X')
    print_board()
    if is_victory("X"):
        print('X Wins! Congratulations!')
    elif is_draw():
        print('its a draw!')
    player_move('O')
    if is_victory("O"):
        print_board()
        print('O Wins! Congratulations!')
    elif is_draw():
        print('its a draw!')