[Tutor] what happens when...

[josip]

Hi all!
  Can You explain me what happens when in this function I remove board arg:
  def human_move(board, human)?
  What is doing that argument?
   
  Thanks!
   
   
   
   
  # global constants
X = "X"
O = "O"
EMPTY = " "
TIE = "TIE"
NUM_SQUARES = 9
  
def display_instruct():
    """Display game instructions."""  
    print \
    """
    Welcome to the greatest intellectual challenge of all time: Tic-Tac-Toe.  
    This will be a showdown between your human brain and my silicon processor.  
      You will make your move known by entering a number, 0 - 8.  The number 
    will correspond to the board position as illustrated:
    
                    0 | 1 | 2
                    ---------
                    3 | 4 | 5
                    ---------
                    6 | 7 | 8
      Prepare yourself, human.  The ultimate battle is about to begin. \n
    """
  
def ask_yes_no(question):
    """Ask a yes or no question."""
    response = None
    while response not in ("y", "n"):
        response = raw_input(question).lower()
    return response
  
def ask_number(question, low, high, step=1):
    """Ask for a number within a range."""
    response = None
    while response not in range(low, high, step):
        response = int(raw_input(question))
    return response
  
def pieces():
    """Determine if player or computer goes first."""
    go_first = ask_yes_no("Do you require the first move? (y/n): ")
    if go_first == "y":
        print "\nThen take the first move.  You will need it."
        human = X
        computer = O
    else:
        print "\nYour bravery will be your undoing... I will go first."
        computer = X
        human = O
    return computer, human
  
def new_board():
    """Create new game board."""
    board = []
    for square in range(NUM_SQUARES):
        board.append(EMPTY)
    return board
  
def display_board(board):
    """Display game board on screen."""
    print "\n\t", board[0], "|", board[1], "|", board[2]
    print "\t", "---------"
    print "\t", board[3], "|", board[4], "|", board[5]
    print "\t", "---------"
    print "\t", board[6], "|", board[7], "|", board[8], "\n"
  
def legal_moves(board):
    """Create list of legal moves."""
    moves = []
    for square in range(NUM_SQUARES):
        if board[square] == EMPTY:
            moves.append(square)
    return moves
  
def winner(board):
    """Determine the game winner."""
    WAYS_TO_WIN = ((0, 1, 2),
                   (3, 4, 5),
                   (6, 7, 8),
                   (0, 3, 6),
                   (1, 4, 7),
                   (2, 5, 8),
                   (0, 4, 8),
                   (2, 4, 6))
    
    for row in WAYS_TO_WIN:
        if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY:
            winner = board[row[0]]
            return winner
      if EMPTY not in board:
        return TIE
      return None
  
def human_move(human):  # <= here is board removed
    """Get human move."""  
    legal = legal_moves(board)
    move = None
    while move not in legal:
        move = ask_number("Where will you move? (0 - 8):", 0, NUM_SQUARES)
        if move not in legal:
            print "\nThat square is already occupied, foolish human.  Choose another.\n"
    print "Fine.."
    return move
  
def computer_move(board, computer, human):
    """Make computer move."""
    # make a copy to work with since function will be changing list
    board = board[:]
    # the best positions to have, in order
    BEST_MOVES = (4, 0, 2, 6, 8, 1, 3, 5, 7)
   
    print "I shall take square number",
    
    # if computer can win, take that move
    for move in legal_moves(board):
        board[move] = computer
        if winner(board) == computer:
            print move
            return move
        # done checking this move, undo it
        board[move] = EMPTY
    
    # if human can win, block that move
    for move in legal_moves(board):
        board[move] = human
        if winner(board) == human:
            print move
            return move
        # done checkin this move, undo it
        board[move] = EMPTY
      # since no one can win on next move, pick best open square
    for move in BEST_MOVES:
        if move in legal_moves(board):
            print move
            return move
  
def next_turn(turn):
    """Switch turns."""
    if turn == X:
        return O
    else:
        return X
      
def congrat_winner(the_winner, computer, human):
    """Congratulate the winner."""
    if the_winner != TIE:
        print the_winner, "won!\n" 
    else:
        print "It's a tie!\n"
      if the_winner == computer:
        print "As I predicted, human, I am triumphant once more.  \n" \
              "Proof that computers are superior to humans in all regards."
      elif the_winner == human:
        print "No, no!  It cannot be!  Somehow you tricked me, human. \n" \
              "But never again!  I, the computer, so swears it!"
      elif the_winner == TIE:
        print "You were most lucky, human, and somehow managed to tie me.  \n" \
              "Celebrate today... for this is the best you will ever achieve."
  
def main():
    display_instruct()
    computer, human = pieces()
    turn = X
    board = new_board()
    display_board(board)
      while not winner(board):
        if turn == human:
            move = human_move(human)  #and here is board removed
            board[move] = human
        else:
            move = computer_move(board, computer, human)
            board[move] = computer
        display_board(board)
        turn = next_turn(turn)
      the_winner = winner(board)
    congrat_winner(the_winner, computer, human)
  
# start the program
main()
raw_input("\n\nPress the enter key to quit.")

 		
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