Simple TicTacToe game.

tictac.py

import os

# Create a dictionary to store moves in.
spots = {'a1' : " ", 'b1' : " ", 'c1' : " ", 'a2' : " ", 'b2' : " ", 'c2' : " ", 'a3' : " ", 'b3' : " ", 'c3' : " "}

# list of moves that have already been made.
illegal_moves = []

# Don't let the game go on for ever.
turns = 10
message = "Let's play Tic Tac Toe."

while turns != 0:
    # Draw board
    row_1 = ' {0} | {1} | {2}'.format(spots.get('a1'), spots.get('b1'), spots.get('c1'))
    row_2 = ' {0} | {1} | {2}'.format(spots.get('a2'), spots.get('b2'), spots.get('c2'))
    row_3 = ' {0} | {1} | {2}'.format(spots.get('a3'), spots.get('b3'), spots.get('c3'))

    os.system('clear')
    print(message)
    print(" ")
    print("     a   b   c ")
    print(" ")
    print("1  ", row_1, end="\n")
    print("    ---|---|---", end="\n")
    print("2  ", row_2, end="\n")
    print("    ---|---|---", end="\n")
    print("3  ", row_3, end="\n")
    print(" ")

    # Select player, starts with X. 
    if turns % 2 == 0:
        player = "X"
    else:
        player = "O"
        
    if turns != 1:
        
        choice = input(f"Enter the column and row of your move, {player}: ")
        print(" ")

        # make sure the move is possible (ie in the spots dictionary)
        while choice not in spots:
            choice = input(f"Enter a valid move, {player}: ")
        else:
            pass
            
        # Make sure another player hasn't already made that move. 
        while choice in illegal_moves:
            choice = input(f"Please make a choice that hasn't already been made, {player}: ")
        else:
            pass

        # write to the board if the move is ok
        spots[choice] = player
        # make it such that the move can't be made again.
        illegal_moves.append(choice)

        # Check if at the end of this round a player has already won
        # Surely, there's a better way of doing this??
        if spots['a1'] == spots['a2']  == spots['a3'] == player or spots['b1'] == spots['b2'] == spots['b3'] == player or spots['c1'] == spots['c2'] == spots['c3'] == player or spots['a1'] == spots['b1'] == spots['c1'] == player or spots['a2'] == spots['b2'] == spots['c2'] == player or spots['a3'] == spots['b3'] == spots['c3'] == player or spots['a1'] == spots['b2'] == spots['c3'] == player or spots['a3'] == spots['b2'] == spots['c1'] == player:
            
            message = (f"{player} wins!")
            turns = 2
       
    turns = turns - 1
    
print(" ")
print("Game Over!")

# Things to clean up: printing could be done with one single line, would be cool to write the dictionary so that it used input to produce the grid for extra large ttt action.     

# Other things to try: Curses? Colors?