Gfrktyl

This is my first program written outside of using books and tutorials. Any help on style and functionality would be helpful.

import sys

from textwrap import dedent

import os

import random







os.system('CLS') 



# board number setup

board = [0,1,2,

         3,4,5,

         6,7,8]



# Defines the board layout printed to the console

def board_layout():

    print(dedent(f''' 

    *************

    * {board[0]} | {board[1]} | {board[2]} *

    *-----------*

    * {board[3]} | {board[4]} | {board[5]} *

    *-----------*

    * {board[6]} | {board[7]} | {board[8]} *

    *************

    '''))





move_count= 0

def main():

    while  True:



        #Prints board layout to console.

        board_layout()

        #checks for a winner when called at end of each turn

        def check_winner():

            global move_count

            #list of lists with all the winning combinations for from the tic tac toe board

            winning_list = [[board[0],board[1],board[2]],[board[3],board[4],board[5],],

            [board[6],board[7],board[8]],[board[0],board[4],board[8]],[board[2],board[4],board[6]],

            [board[0],board[3],board[6]],[board[1],board[4],board[7]],[board[2],board[5],board[8]]]

            #Keeps a reference to winning_list so it is updated at the end of every turn        

            new_list = winning_list



            #iterates over the lists in winning_list

            for i,j,k in winning_list:

                #looks at the lists in winning_list to determine if a list has all x's for a win

                if i ==  'x' and j ==  'x' and k ==  'x' :

                    print('X wins')

                    end()

                #looks at the lists in winning_list to determine if a list has all o's for a win

                elif i ==  'o' and j ==  'o' and k ==  'o' :

                    print('O wins')

                    end()

            #possible moves is 9 in tic tac toe. If all moves are taken and there is no winner no winner forces a draw. 

            if move_count == 9:

                print('You Tied')

                end()









        #Takes user input for the move

        move =int(input('Please select a spot: '))

        print(move)



        #Player move, makes sure the spot is not taken and adds 1 to move_count

        if board[move] !='x' and board[move] != 'o':

            board[move] = 'x'

            move_count += 1

            check_winner()  

            #npc move, chooses a random spot that is not taken and adds 1 to move_count

            while True:

                npc = random.randint(0,8)

                if board[npc] != 'o' and board[npc] != 'x':

                    board[npc] = 'o'

                    print('Computer chooses spot ', npc)

                    move_count += 1

                    check_winner()

                    break

        #If spot is taken prints that the spot is already taken

        else:

            print('This spot is taken')



        #Game ending

        def end():

            print('Thank you for playing')

            sys.exit()



if __name__ == "__main__":

    main()