tic_tac_toe.py

board = [
        [None, None, None],
        [None, None, None],
        [None, None, None]
    ]
    
def available_goes():
    return len([item for item in [x for sublist in [board[0], board[1], board[2]] for x in sublist] if item is None]) > 0

def set_position(player, x, y):
    if (board[x][y] == None):
        board[x][y] = player
        return True
    return False
    
def render_position(x, y):
    return board[x][y] or " "
    
def check_winner():

    if len(set(board[0])) == 1 and board[0][0] is not None:
        return board[0][0]
    elif len(set(board[1])) == 1 and board[1][0] is not None:
        return board[1][0]
    elif len(set(board[2])) == 1 and board[2][0] is not None:
        return board[2][0]
    elif board[0][0] is not None and board[0][0] == board[1][0] and board[1][0] == board[2][0]:
        return board[0][0]
    elif board[0][1] is not None and board[0][1] == board[1][1] and board[1][1] == board[2][1]:
        return board[0][1]
    elif board[0][2] is not None and board[0][2] == board[1][2] and board[1][2] == board[2][2]:
        return board[0][2]
    elif board[0][0] is not None and board[0][0] == board[1][1] and board[1][1] == board[2][2]:
        return board[0][0]
    elif board[0][2] is not None and board[0][2] == board[1][1] and board[1][1] == board[2][0]:
        return board[0][2]
    
    return None

def print_board():
    print("  0   1   2")
    print(f"0 {render_position(0, 0)} | {render_position(0, 1)} | {render_position(0, 2)}")
    print(" ---+---+---")
    print(f"1 {render_position(1, 0)} | {render_position(1, 1)} | {render_position(1, 2)}")
    print(" ---+---+---")
    print(f"2 {render_position(2, 0)} | {render_position(2, 1)} | {render_position(2, 2)}")

winner = None

player = None

print_board()

while winner == None:
    if player == "X":
        player = "O"
    else:
        player = "X"
    
    move = input(f"Player {player}, where do you want to go?")
    x, y = [int(v) for v in move.split(" ", 1)] 
    
    if set_position(player, x, y) == False:
        print("That position is already taken, try again")
        continue

    print_board()
    
    winner = check_winner()
    
    if winner is not None:
        print(f"The winner was '{winner}'")
    elif not available_goes():
        print(f"It was a tie")
        break
    

tic_tac_toe_2.py

board = {
          "A": [None, None, None],
          "B": [None, None, None],
          "C": [None, None, None]
    }
    
def available_goes():
    return len([item for item in [x for sublist in [board["A"], board["B"], board["C"]] for x in sublist] if item is None]) > 0

def set_position(player, x, y):
    if (board[x][y] == None):
        board[x][y] = player
        return True
    return False
    
def render_position(x, y):
    return board[x][y] or " "
    
def check_winner():

    if len(set(board["A"])) == 1 and board["A"][0] is not None:
        return board["A"][0]
    elif len(set(board["B"])) == 1 and board["B"][0] is not None:
        return board["B"][0]
    elif len(set(board["C"])) == 1 and board["C"][0] is not None:
        return board["C"][0]
    elif board["A"][0] is not None and board["A"][0] == board["B"][0] and board["B"][0] == board["C"][0]:
        return board["A"][0]
    elif board["A"][1] is not None and board["A"][1] == board["B"][1] and board["B"][1] == board["C"][1]:
        return board["A"][1]
    elif board["A"][2] is not None and board["A"][2] == board["B"][2] and board["B"][2] == board["C"][2]:
        return board[0][2]
    elif board["A"][0] is not None and board["A"][0] == board["B"][1] and board["B"][1] == board["C"][2]:
        return board["A"][0]
    elif board["A"][2] is not None and board["A"][2] == board["B"][1] and board["B"][1] == board["C"][0]:
        return board["A"][2]
    
    return None

def print_board():
    print("  A   B   C")
    print(f"0 {render_position('A', 0)} | {render_position('B', 0)} | {render_position('C', 0)}")
    print(" ---+---+---")
    print(f"1 {render_position('A', 1)} | {render_position('B', 1)} | {render_position('C', 1)}")
    print(" ---+---+---")
    print(f"2 {render_position('A', 2)} | {render_position('B', 2)} | {render_position('C', 2)}")

winner = None

player = None

print_board()

while winner == None:
    if player == "X":
        player = "O"
    else:
        player = "X"
    
    move = input(f"Player {player}, where do you want to go?")
    x, y = [char if index == 0 else int(char) for index, char in enumerate(move)]
    
    if set_position(player, x, y) == False:
        print("That position is already taken, try again")
        continue

    print_board()
    
    winner = check_winner()
    
    if winner is not None:
        print(f"The winner was '{winner}'")
    elif not available_goes():
        print(f"It was a tie")
        break

tic_tac_toe_current.py

board = {
  "A": [None, None, None],
  "B": [None, None, None],
  "C": [None, None, None]
}

def render_position(x, y):
  return board[x][y] or " "
    
def print_board():
  print(f"  A   B   C")
  print(f"0 {render_position('A', 0)} | {render_position('B', 0)} | {render_position('C', 0)}")
  print(f" ---+---+---")
  print(f"1 {render_position('A', 1)} | {render_position('B', 1)} | {render_position('C', 1)}")
  print(f" ---+---+---")
  print(f"2 {render_position('A', 2)} | {render_position('B', 2)} | {render_position('C', 2)}")

def set_position(x, y, player):
    if (x not in ["A", "B", "C"] or y not in [0, 1, 2]):
      print("Not a valid position, try again")
      return True
    if (board[x][y] == None):
      board[x][y] = player
      print("That position is already taken, try again")
      return True
    return False

winner = None

player = None

print_board()

while winner == None:
    if player == "X":
        player = "O"
    else:
        player = "X"
    
    move = input(f"Player {player}, where do you want to go?")
    x, y = [char if index == 0 else int(char) for index, char in enumerate(move)]
    
    if set_position(x, y, player) == False:
      print("That position is already taken, try again")
      continue

    print_board()