# What's wrong?

#1

Traceback (most recent call last):
File "python", line 23, in
ValueError: invalid literal for int() with base 10: ''

What does it mean?

``````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!
board[guess_row, guess_col]="X"

if guess_row not in range(5) or guess_col not in range(5):
print "Oops, that's not even in the ocean."
elif guess_row == ship_row and guess_col == ship_col:
print "Congratulations! You sank my Battleship!"
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"``````

#2

When you were meant to guess a number, you probably put something like `5\` or a letter.

#3

I'm still getting this:

Guess Row: 2
Guess Col: 2
1
1
Traceback (most recent call last):
File "python", line 29, in
TypeError: list indices must be integers, not tuple

#4

I'm still getting this:

Guess Row: 2
Guess Col: 2
1
1
Traceback (most recent call last):
File "python", line 29, in
TypeError: list indices must be integers, not tuple

#5

Refresh your page and give the system correct input.

#6

Remove this `board[guess_row, guess_col]="X"`. and try.
Since this is a type of tuple assignment.