14/19 Test Run


#1
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)
print ship_row
print ship_col

guess_row = int(raw_input("Guess Row: "))
guess_col = int(raw_input("Guess Col: "))

# Write your code below!
if guess_row == ship_row and guess_col == guess_col:
  print "Congratulations! You sank my battleship!"
elif board[guess_row][guess_col] == "X":
  print "You guessed that one already."
else:
  if 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)

I’m throwing this error: 'Traceback (most recent call last):
File “python”, line 31, in
IndexError: list index out of range’
Whenever I give an answer that’s outside the grid. Isn’t the code designed to accept when I give a value that’s not in the grid?


#2

if done right, yes. You access the board by index:

elif board[guess_row][guess_col] == "X":

before validating the is on the board:

if guess_row not in range (5) or guess_col not in range(5):

as a result of this, the index error can still occur. board[guess_row][guess_col] should never be reached when shot is not on the board


#3

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