# 14. Test Run - Accounting for blank or non-int inputs

#1

Hi, all. What is the best way to account for any blank or non-int input (string, alphanumeric, etc.) for guess_row and guess_col?

This is the error message with any non-int input:

``````Traceback (most recent call last):
File "python", line 22, in <module>
ValueError: invalid literal for int() with base 10: '1 1'``````

My current code:

``````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:
if guess_row not in range(5) or \
guess_col not in range(5):
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_board(board)``````

Any help would be greatly appreciated!

#2

This is line 22 ...

``guess_row = int(raw_input("Guess Row:"))``

The `int` built in function raises an error if you try to convert a value to an `int`, if that conversion cannot be performed. If you enter the string, `"1 1"`, as input, it cannot be converted to an `int`.

#3

@geomaticmashups

Thank you so much for pointing this out. It makes perfect sense now!