TicTacToeVSComp.py

import random
board = ["-","-","-",
        "-","-","-",
        "-","-","-"]

currentPlayer = "T"
winner = None
gameRunning = True

def printBoard(board):
    print(board[0] + "|" + board[1] + "|" + board[2])
    
    print(board[3] + "|" + board[4] + "|" + board[5])
    
    print(board[6] + "|" + board[7] + "|" + board[8])

def playerInput(board):
    inp = int(input ("Enter a Number from 1-9: "))
    if inp >= 1 and inp <= 9 and board[inp-1] == "-":
        board[inp-1] = currentPlayer

    else:
        print("OOPS! player is already there")


def checkHorizontal(board):
    global winner
    if board[0] == board[1] == board[2] and board[1] != "-":
        winner = board[0]
        return True
    elif board[3] == board[4] == board[5] and board[3] != "-":
        winner = board[3]
        return True
    elif board[6] == board[7] == board[8] and board[6] != "-":
        winner = board[3]
        return True

def checkRows(board):
    global winner
    if board[0] == board[3] == board[6] and board[0] != "-":
        winner = board[0]
        return True
    elif board[1] == board[4] == board[7] and board[1] != "-":
        winner = board[1]
        return True
    elif board[2] == board[5] == board[8] and board[2] != "-":
        winner = board[2]
        return True
def checkDiagonal(board):
    global winner
    if board[0] == board[4] == board[8] and board[0] != "-":
        winner = board[0]
        return True
    elif board[2] == board[4] == board[6] and board[2] != "-":
        winner = board[1]
        return True
 
def checkTie(board):
    if "-" not in board:
        printBoard(board)
        print("It's a Tie")
        gameRunning = False

def checkWin():
    if checkDiagonal(board) or checkHorizontal(board) or checkRows(board):
        print(f"The winner is {winner} ")
        gameRunning = False

def switchPlayer():
    global currentPlayer
    if currentPlayer == "T":
        currentPlayer = "O"

    else:
        currentPlayer = "T"

def computer(board):
    while currentPlayer == "O":
        position = random.randint(0,8)
        if board[position] == "-":
            board[position] = "O"
            switchPlayer()


while gameRunning:
    printBoard(board)
    playerInput(board)
    checkWin()
    checkTie(board)
    switchPlayer()
    computer(board)
    checkWin()
    checkTie(board)