tic_tac_toe.py

import random
import time

# game board
board = [[1], [2], [3],
            [4], [5], [6],
            [7], [8], [9]
            ]

game = True

# coin_flip to choose who goes first
print("Time for a coin toss players. Choose heads or tails.")

# allow players time to choose heads or tails;
time.sleep(2)

coin_toss = random.randint(0, 1) % 2

if coin_toss == 0:
    result = "Heads"
else:
    result = "Tails"

# display winner of coin toss
print(f"The {result} wins! The winner is Player One and will play 'X' and move first")
playing_X = True

# game engine
turn = 0

while game == True:
    display_board = f"{board[0]}|{board[1]}|{board[2]}\n{board[3]}|{board[4]}|{board[5]} \n{board[6]}|{board[7]}|{board[8]} \n"

    turn += 1
    if  playing_X == True:
        print(display_board)
        move = int(input("Please enter the number where you want your mark:  "))

        # test to see if desired space taken
        try:
            # find board coordinates
            place = board.index([move])
            board[place] = 'X'
            playing_X = False
            print(display_board)
        except:
            print("Sorry, that is not a valid move. Check the board and try again.")
            playing_X = True

        print(display_board)
    else:
        print(display_board)
        move = int(input("Please enter the number where you want your mark:  "))
        # test to see if desired space taken
        try:
            # find board coordinates
            place = board.index([move])
            board[place] = 'O'
            # print(display_board)
        except:
            print("Sorry, that is not a valid move. Check the board and try again.")
            # function call to move later in game development
            playing_X = False
        # playing_X = True

    # Check for win condition or tie
    if (turn > 8 and game == True):
        print(f"There is a TIE! Well done players! Best two out of three ; )?")
        game = False

    if turn > 3:
    # rows
        if board[0] == board[1] and board[1] == board[2]:
            print(f"Player {board[0]} is the WINNER!")
            game = False

        elif board[3] == board[4] and board[4] == board[5]:
            print(f"Player {board[3]} is the WINNER! ")
            game = False

        elif board[6] == board[7] and board[7] == board[8]:
            print(f"Player {board[0]} is the WINNER!")
            game = False
    # columns
        elif board[0] == board[3] and board[3] == board[6]:
            print(f"Player {board[0]} is the WINNER!")
            game = False

        elif board[1] == board[4] and board[4] == board[7]:
            print(f"Player {board[1]} is the WINNER!")
            game = False
        elif board[2] == board[5] and board[5] == board[8]:
            print(f"Player {board[2]} is the WINNER!")
            game = False
    # diagonal
        elif board[0] == board[4] and board[4] == board[8]:
            print(f"Player {board[0]} is the WINNER!")
            game = False

        elif board[2] == board[4] and board[4] == board[6]:
            print(f"Player {board[2]} is the WINNER!")
            game = False
        else:
            continue