16/19 Game over - Why two X?


#1

My result came as below. I wonder why at the fourth game, there are two X?

Let's play Battleship!
O O O O O
O O O O O
O O O O O
O O O O O
O O O O O
2
1
Guess Row: 2
Guess Col: 4
You missed my battleship!
Turn 1
O O O O O
O O O O O
O O O O X
O O O O O
O O O O O
Guess Row: 7
Guess Col: 5
Oops, that's not even in the ocean.
Turn 2
O O O O O
O O O O O
O O O O X
O O O O O
O O O O O
Guess Row: 8
Guess Col: 4
Oops, that's not even in the ocean.
Turn 3
O O O O O
O O O O O
O O O O X
O O O O O
O O O O O
Guess Row: 3
Guess Col: 3
You missed my battleship!
Turn 4
O O O O O
O O O O O
O O O O X
O O O X O
O O O O O
Game Over
None


my code

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!"
print_board(board)

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)
print ship_row
print ship_col


# Everything from here on should go in your for loop!
# Be sure to indent four spaces!
for turn in range(4):

    guess_row = int(raw_input("Guess Row:"))
    guess_col = int(raw_input("Guess Col:"))
    
    if guess_row == ship_row and guess_col == ship_col:
        print "Congratulations! You sunk my battleship!"
    else:
        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."
        else:
            print "You missed my battleship!"
            board[guess_row][guess_col] = "X"
        print "Turn", turn + 1
        print_board(board)
    if turn == 3:
                print "Game Over"

#2

I'm not sure, maybe because you have:
'(board[guess_row][guess_col] == "X"):'
and
'board[guess_row][guess_col] = "X" '.


#3

I did this part twice, and figured out.

It's because I set the game to mark "X" when it my guess_row and guess_col is between index 0-3.
So, you see wherever marked as "X", i guess my row and col among index 0-3.
I did it twice. That's why there are two X.

I guess out of range twice, and that's why they are not marked.