# Play It, Sam

#1

i really dont get why its showing this

Oops, try again. Your code looks a bit off. Check the Hint if you need help! Your code threw the following error: invalid literal for int() with base 10: ''

It looks correct i dont understand why it doesn't work

``````Replace this line with your 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!
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)``````

#2

There should be a console error (in red text) with traceback information. Please post that error message in its entirely. Thanks.

#3

Traceback (most recent call last):
File "python", line 29, in
ValueError: invalid literal for int() with base 10: ''

#4

Traceback (most recent call last):
File "python", line 29, in
ValueError: invalid literal for int() with base 10: ''

#5

For me that happens when i don't enter any number and just press enter

#6

Correct. The error indicates non-numeric return value from `raw_input()`. (Line 29 and/or 30 will raise this error if no number is inputted.).

Aside

We can make the code easier to read with two simple changes...

``elif guess_row not in range(5) or guess_col not in raange(5):``

and,

``````if ___:

elif ___:

elif ___:

else: ___``````

No need for extra nesting, as in,

``````else:
if ____:``````

#7

yes that worked thank you so much!!!

#8

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