# Danger, Will Robinson!

#1

Hi,
This line: “X” = board[guess_row - 1][guess_col - 1], the error states that it can’t assign to literal. May I know why is this so?

Below is my 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)
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!"
else:
print “You missed my battleship!”
“X” = board[guess_row - 1][guess_col - 1]
print_board(board)`Preformatted text`

#2

If you do

`"x"=5+5`

you’ll get an error

SyntaxError: `can't assign to literal`

but if you do

no

`x=5+5`

no error

now consider what is `x` in both case?

#3

For the first line “x” is a string, while the other one is simply a variable?
I can see that a string cannot be the sum of two numbers

Is there a difference between

board[guess_row - 1][guess_col - 1] = “X”
“X” = board[guess_row - 1][guess_col - 1]

#4

Of course there is

In the first line of code you are assigning `"X"` to `board[guess_row - 1][guess_col - 1]` that is valid.

But for the second one you are trying to assign `board[guess_row - 1][guess_col - 1]` to `"X"` that is invalid.

the object on the left-hand side of the `=` sign can’t be a literal.

#5

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