How "not again" functions?


in fact, i don't understand how "Not again"code functions?
elif(board[guess_row][guess_col] == "X"):
print "You guessed that one already."

from random import randint
board = []

for x in range(5):
    board.append(["O"] * 5)
def print_board(board):
    for row in board:
        print " ".join(row)
print "Let's play Battleship!"

def random_row(board):
    return randint(0, len(board) - 1)
def random_col(board):
    return randint(0, len(board[0]) - 1)
ship_row = random_row(board)
ship_col = random_col(board)

for turn in range(4):
    print "Turn",turn+1
    guess_row = int(raw_input("Guess Row:"))-1
    guess_col = int(raw_input("Guess Col:"))-1
    if guess_row == ship_row and guess_col == ship_col:
        print "Congratulations! You sunk my battleship!"
        if (guess_row < 0 or guess_row > 4) or\
        (guess_col < 0 or guess_col > 4):
            print "Oops, that's not even in the ocean."
        elif(board[guess_row][guess_col] == "X"):
            print "You guessed that one already."
            print "You missed my battleship!"
            board[ship_row][ship_col] = "X"
    if turn==3:
        print "Game Over"


When an unoccupied cell is chosen, it gets new content, an 'X'. When a subsequent guess matches the same cell, we are told so, and guess again.

We are guessing a row, and a column. That gives us two vectors, hence two subscripts.


The normal content is 'O'. An already guessed cell will have an 'X'.

        elif board[guess_row][guess_col] == "X":
            print "You guessed that one already."


i get it~ thank you:grin:


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