http://inventwithpython.com/chapter10.html

여기서 나오는건데


def isSpaceFree(board, move):
    # Return true if the passed move is free on the passed board.
    return board[move] == ' '

def getPlayerMove(board):
    # Let the player type in his move.
    move = ' '
    while move not in '1 2 3 4 5 6 7 8 9'.split() or not isSpaceFree(board, int(move)):
        print('What is your next move? (1-9)')
        move = input()
    return int(move)



여기서 while문에 함수 isSpaceFree(board, int(move)):가 오는걸 어케해석해야대나요?

한번도 배운적이 없는데 나오니까 이해가 안대네요