Oops, try again. Make sure you print "Oops, that's not even in the ocean." if the user guesses a row or column that is off the board.
if guess_row == ship_row and guess_col == ship_col: print "Congratulations! You sank my battleship!" elif guess_row not in range(5) or guess_col not in range(5): print "Oops, that's not even in the ocean" else: print "You missed my battleship!" board[guess_row][guess_col] = "X" print_board(board)