11. Danger, Will Robinson


#1



https://www.codecademy.com/en/courses/python-beginner-en-4XuFm/1/2?curriculum_id=4f89dab3d788890003000096


Hello, I am having issues because when I run the code the column and row that I guessed only places 1 "X" in the whole row as shown and doesn't show the rest of the "O":


Any advice or guidance would be appreciated.


from random import randint

board = []

for x in range(0, 5):
    board.append(["O"] * 5)

def print_board(board):
    for row in board:
        print " ".join(row)

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)
guess_row = int(raw_input("Guess Row:"))
guess_col = int(raw_input("Guess Col:"))

print ship_row
print ship_col

# Write your code below!
if guess_row == ship_row and guess_col == ship_col:
    print "Congratulations! You sank my battleship!"
else:
    print "You missed my battleship!"
    board[guess_row] = "X"
    board[guess_col] = "X"
    print_board(board)


#2

We need to combine the indices...

board[guess_row][guess_col]

Recall that board is a list of lists. The row points to the list, the col points to the item in that list.


#3

Shouldn't that be board[guess_row - 1] = "X" and board[guess_col - 1] = "X" since values start at 0?


#4

board = [
    ['O', 'O', 'O', 'O', 'O'],    # guess_row
    ['O', 'O', 'O', 'O', 'O'],
    ['O', 'O', 'O', 'O', 'O'],
    ['O', 'O', 'O', 'O', 'O'],
    ['O', 'O', 'O', 'O', 'O']
]

Now consider,

board[guess_row - 1] = "X"

If guess_row is 0 this will result in the last position being selected, but assuming it is not 0 (say, 4) then the result will be,

board = [
    ['O', 'O', 'O', 'O', 'O'],
    ['O', 'O', 'O', 'O', 'O'],
    ['O', 'O', 'O', 'O', 'O'],
    "X",                        # guess_row == 4
    ['O', 'O', 'O', 'O', 'O']
]

#5

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