FAQ: Learn Python - Battleship - Danger, Will Robinson!

This community-built FAQ covers the " Danger, Will Robinson!!" exercise in Codecademy’s lessons on Python.

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2 posts were split to a new topic: How do I set the list element

Why is my code giving this error: ValueError: invalid literal for int() with base 10: ‘RUN’ or ValueError: invalid literal for int() with base 10: ‘SCT’ ? what can I do to solve it?


Edit: I’ll leave this here if anyone spots a possible cause. But reloading the webpage seems to get it working fine. I’m guessing cache issue.

The tutorial is giving me the next option, but my first guess is automatically duplicated into the second guess option meaning I can’t guess the column, and the guesses are then only possible on a diagonal from 0,0 to 4,4.

I can’t see a cause, any ideas?

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)


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: "))

if guess_row == ship_row and guess_col == ship_col:
  print "Congratulations! You sank my battleship!"
  print "You missed my battleship!"
  board[guess_row][guess_col] = "X"