Tukukkk

i am new to python. i am making a game similar to tic-tac-toe, but on a larger scale. i am able to see the grid before user input, but after the user inputs where they want their piece to go the updated grid does not show.
the output will just say none. im thinking my problem is in how im displaying the board, but i am unsure.Please help

print("This is Gomoku Deluxe!")



#starting off with tic-tac-toe



import os



#this is where the code for the game starts

board = 



for i in range(19):

 board.append(["O"] * 19)





#function to print board

def print_board():

    board = 

    for i in range(19):

      board.append(["O"] * 19)

    for row in board:

      print (row)



#function to place player piece

def drop_point(board, row, col, piece):

    board[row][col] = piece



#function checks for empty spot

def valid_location(board, row, col):

    return board[row][col] == 0



# this loop handles user's piece 

print_board()

turn = 0

game_over = False



while not game_over:

    if turn == 0:

      row = int(input("Player 1 Select a row: "))

      col = int(input("Player 1 Select a col: "))



      if valid_location(board, row, col):

          drop_point(board, row, col, 1)



    else:

      row1 = int(input("Player 2 Select a row: "))

      col1 = int(input("Player 2 Select a col: "))



      if valid_location(board, row1, col1):

          drop_point(board, row1, col1, 2)



    print_board()



    turn += 1

    turn = turn % 2

Ok there were a few errors in your code.

1.) In the valid_location function you were checking if the piece was equal to 0 even though you assigned it as "O"

2.) In the print_board function you were making a new board everytime.

3.) In the drop_point function you were only assigning the value to board inside the function

Here's some new and improved code:

print("This is Gomoku Deluxe!")



#starting off with tic-tac-toe



import os



#this is where the code for the game starts

board = 



for i in range(19):

 board.append([0] * 19)





#function to print board

def print_board(brd):

    for row in brd:

      print (row)



#function to place player piece

def drop_point(brd, row, col, piece):

    brd[row][col] = piece

    return brd



#function checks for empty spot

def valid_location(board, row, col):

    return board[row][col] == 0



# this loop handles user's piece 

print_board(board)

turn = 0

game_over = False



while not game_over:

    if turn == 0:

      row = int(input("Player 1 Select a row: "))

      col = int(input("Player 1 Select a col: "))



      if valid_location(board, row, col):

          board = drop_point(board, row, col, 1)



    else:

      row1 = int(input("Player 2 Select a row: "))

      col1 = int(input("Player 2 Select a col: "))



      if valid_location(board, row1, col1):

          board = drop_point(board, row1, col1, 2)



    print_board(board)



    turn += 1

    turn = turn % 2