This is a quickie. The assignment is to build a "Battleship" style grid of 0's. My question is: why is "none" printing after my grid prints? I could easily get through the assignment, but since I'm doing this to learn code I figured I would ask. Thanks!
board = 
for x in range(5):
board.append(["O"] * 5)
for row in board:
I just did the module for myself on Codecademy. I can see why you got confused, the instructions are pretty confusing.
They really want you to do this:
board =  for x in range(0, 5): board.append(["O"] * 5) def print_board(board): for row in board: print " ".join(row)
"---".join(row) was an example showing you how to use join with characters. The instructions on the left side then ask you to use
" ".join(row) in the example.
Codecademy automatically prints
None at the end of each output for no apparent reason and if you use the
" ".join(row) it will be correct with this output:
O O O O O O O O O O O O O O O O O O O O O O O O O None