# Danger, Will Robinson problem

#1

I get the error "Make sure to enter a col and row that is on the board!"
I was wondering where my mistake is. I'm pretty sure I followed the instructions right.

``````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

if guess_row == ship_row and guess_col == ship_col:
print "Congratulations! You sank my battleship!"
else:
print "You missed my battleship!"
guess_row = "X"
guess_col = "X"
print print_board(board)``````

#2

the problem is here:

``````    guess_row = "X"
guess_col = "X"``````

this will not update `board`, we need to update `board`

Our board is a list, how do we update a value in list?

#3

Ah I got it, I'm wondering why it is not board[guess_row, guess_col] = "X" so as to edit one of the current O's instead of replacing a row of O's?

#4

but `board[guess_row]` gives you the row (which is a list), then we need to get the column, which require another set of square brackets

#5

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