This is the new code, I am unsure if I made the suggestions the the suggestion intended on my previous post First Python program: Tic-Tac-Toe. I have only been working on programming for about 3 weeks so anymore suggestions or insight on the original post of the suggestions would be more than welcomed.

'''python 3.7.4'''

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]} *
    *************
    '''))


def main():
    players = ('Player','NPC')
    turn = 'Player'
    change_turn = 0
    for moves in range(9):
        if turn == 'Player':   
            while True:
                try:
                    board_layout()
                    player_move = int(input('Please select a spot: '))
                    if board[player_move] != 'x' and board[player_move] != 'o':
                        board[player_move] = 'x'
                        check_winner()
                        break
                except IndexError:
                    print('please select valid spot')
        if turn == 'NPC':
             # npc move, chooses a random spot that is not taken 
            while True:
                npc = random.randint(0, 8)
                if board[npc] != 'o' and board[npc] != 'x':
                    board[npc] = 'o'
                    print('Computer chooses spot ', npc)
                    check_winner()
                    break  
        try:
            change_turn += 1
            turn = players[change_turn]
        except:
            change_turn = 0
            turn = players[change_turn]
    else:
       print('You Tied')
       end()       
       
        
        


def end():
        print('Thank you for playing')
        answer = input('Would you like to play again?: Y/N')
                  
        if answer.lower() == 'n':
            quit()
        elif answer.lower() == 'y':
                    clear_board()
                    main()
        else:
            print('Please choose a valid option')
            end()
        
def clear_board():
    for i in range(9):
        board[i] = i
 
# checks for a winner when called at end of each turn        
def check_winner():
            
            # 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]]]
            
            # 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()
        

if __name__ == "__main__":
    main()