Terminal Tic Tac Toe

main.py

class Game():
    '''
    Tic Tac Toe terminal game
    '''
    def __init__(self):
        '''Set initial variables and start game'''
        self.grid = """
            1       2      3

                ||     ||
        A    {a1}  ||  {a2}  ||  {a3}  
                ||     ||
          =====================
                ||     ||
        B    {b1}  ||  {b2}  ||  {b3}  
                ||     ||
          =====================
                ||     ||
        C    {c1}  ||  {c2}  ||  {c3}  
                ||     ||
        """

        self.moves = {
            "a1": " ",
            "a2": " ",
            "a3": " ",
            "b1": " ",
            "b2": " ",
            "b3": " ",
            "c1": " ",
            "c2": " ",
            "c3": " "
        }

        self.player = 1
        self.mark = 'X'
        self.print_board() #Start game

    def switch_player(self):
        self.player = 3 - self.player
        if self.player is 1:
            self.mark = 'X'
        else:
            self.mark = 'O'

    def print_board(self):
        print(self.grid.format(**self.moves))
        if self.check_victory():
            print('Victory! Player {} wins!'.format(self.player))
            self.exit_game()
        elif self.check_draw():
            print('Draw. Game Over.')
            self.exit_game()
        else:
            self.add_move()

    def add_move(self):
        prompt = 'Player {}, what\'s your move? '.format(self.player)
        move = input(prompt).lower().strip()
        move = self.validate(move)

        if move and self.moves.get(move) == " ":
            self.moves[move] = self.mark #sub into moves dict
            self.switch_player()
            self.print_board()
        else:
            print('Invalid move.')
            if move and self.moves.get(move) != " ":
                print('Space taken.')
            self.add_move()

    def validate(self, user_input):
        if len(user_input) is not 2:
            move = False
        elif user_input[0] in ['a', 'b', 'c'] and user_input[1] in ['1', '2', '3']:
            move = user_input
        elif user_input[0] in ['1', '2', '3'] and user_input[1] in ['a', 'b', 'c']:
            move = user_input[1] + user_input[0] #switch order if number first
        else:
            move = False
        return move

    def check_victory(self):
        win = self.moves['a1'] == self.moves['a2'] == self.moves['a3'] != " " or \
              self.moves['b1'] == self.moves['b2'] == self.moves['b3'] != " " or \
              self.moves['c1'] == self.moves['c2'] == self.moves['c3'] != " " or \
              self.moves['a1'] == self.moves['b1'] == self.moves['c1'] != " " or \
              self.moves['a2'] == self.moves['b2'] == self.moves['c2'] != " " or \
              self.moves['a3'] == self.moves['b3'] == self.moves['c3'] != " " or \
              self.moves['a1'] == self.moves['b2'] == self.moves['c3'] != " " or \
              self.moves['a3'] == self.moves['b2'] == self.moves['c1'] != " "
        return win

    def check_draw(self):
        if all(val != " " for val in self.moves.values()):
            return True


    def exit_game(self):
        input('Enter any key to exit. ')

if __name__ == "__main__":
    Game()