TicTacToe Logic

[AhmadMWaddah]

Hello Folks,
I Made Simple TicTacToe, But It seems there is something missd, can any one help me with this, i want to know what i miss as computational thinking.
and here is my GitHub and my code .

https://github.com/AhmadMWaddah/TicTacToeAMW.git

Code:

tic_brd = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']


# Check Board Cells.
def chk_brd(brd):
    while brd[0] == ' ' or brd[1] == ' ' or brd[2] == ' ' or brd[3] == ' ' or brd[4] == ' ' or brd[5] == ' ' or brd[6] == ' ' or brd[7] == ' ' or brd[8] == ' ':
        print('Board Is Not Full.')

        def board_size(cells):
            print(f'||~~~~~||~~~~~||~~~~~||')
            print(f'||  {cells[0]}  ||  {cells[1]}  ||  {cells[2]}  ||')
            print(f'||~~~~~||~~~~~||~~~~~||')
            print(f'||  {cells[3]}  ||  {cells[4]}  ||  {cells[5]}  ||')
            print(f'||~~~~~||~~~~~||~~~~~||')
            print(f'||  {cells[6]}  ||  {cells[7]}  ||  {cells[8]}  ||')
            print(f'||~~~~~||~~~~~||~~~~~||')

        board_size(tic_brd)

        def player_input():
            position_one = ''
            while (position_one.upper() != 'X') or (position_one.upper() != 'O'):
                position_one = input(' Please Enter "X" Or "O".: ').upper()
                if position_one.upper() == 'X':
                    print(f' Player One {position_one}.')
                    break
                elif position_one.upper() == 'O':
                    print(f' Player One {position_one}.')
                    break

            def place_marker(board):
                if position_one:
                    cel = int(input(' Enter Cell: '))
                    while cel < 0 or cel > 9:
                        cel = int(input(f' Cell {cel} Is Out Of Range ( 0 - 8 ): '))
                    else:
                        while board[cel] != ' ':
                            cel = int(input(f' Cell {cel} Is Full Enter Another Cell: '))
                            continue
                        else:
                            board[cel] = position_one

            board_size(tic_brd)

            # Check Win
            def win_check(brdd, pos_on):
                while (brdd[0] == pos_on and brdd[1] == pos_on and brdd[2] == pos_on) or (
                        brdd[3] == pos_on and brdd[4] == pos_on and brdd[5] == pos_on) or (
                        brdd[6] == pos_on and brdd[7] == pos_on and brdd[8] == pos_on) or (
                        brdd[0] == pos_on and brdd[3] == pos_on and brdd[6] == pos_on) or (
                        brdd[1] == pos_on and brdd[4] == pos_on and brdd[7] == pos_on) or (
                        brdd[2] == pos_on and brdd[5] == pos_on and brdd[8] == pos_on) or (
                        brdd[0] == pos_on and brdd[5] == pos_on and brdd[8] == pos_on) or (
                        brdd[2] == pos_on and brdd[4] == pos_on and brdd[6] == pos_on):
                    print(f'Game Over. {pos_on} Win.')
                else:
                    place_marker(tic_brd)
                    board_size(tic_brd)

            win_check(tic_brd, position_one)

        player_input()
    else:
        print(f'Yes, Board Is Full. Game Over. ')


chk_brd(tic_brd)

Thank You In Advance For Support,