[FIXED] What am I doing wrong with my tic-tac-toe game?

Issue

I’m making a game similar to tic-tac-toe, called strikes and circles. The most noticeable difference is that the board is 4 by 4, rather than 3 by 3. (I am a beginner with coding in Python so please bear with me.) I took a chunk of code from an online post that lets you make a tic-tac-toe board, and altered it to make the board the way I needed it. I am now getting an error that states “TypeError: can only concatenate str(not "list") to str.”

theBoard = {'a1': ' ' , 'a2': ' ' , 'a3': ' ' , 'a4': ' ' , 
            'b1': ' ' , 'b2': ' ' , 'b3': ' ' , 'b4': ' ' , 
            'c1': ' ' , 'c2': ' ' , 'c3': ' ' , 'c4': ' ' ,
            'd1': ' ' , 'd2': ' ' , 'd3': ' ' , 'd4': ' ' }

def printboard(board):
print(board['a1']+['|']+['a2']+['|']+['a3']+['|']+['a4'])
  print('-+-+-+-')
  print(board['b1']+['|']+['b2']+['|']+['b3']+['|']+['b4'])
  print('-+-+-+-')
  print(board['c1']+['|']+['c2']+['|']+['c3']+['|']+['c4'])
  print('-+-+-+-')
  print(board['d1']+['|']+['d2']+['|']+['d3']+['|']+['d4'])

I tried changing every + other than the ones in

  print('-+-+-+-')

To “, “ as well as removing the word board from everything below line 10 and changing line ten from

def printboard(board):

To

def printboard(self):

And neither attempts worked the way I had hoped.

I just want a 4 by 4 tic-tac-toe board that works.

Solution

What you are doing is wrong. You are trying to do ['a2'] and so on which returns nothing but a list. What you expect is the value of the a2 key from the board variable. Therefore, it needs to be changed to board['a2'] Try this:

def printboard(board):
    print(board['a1']+'|'+board['a2']+'|'+board['a3']+'|'+board['a4'])
    print('-+-+-+-')
    print(board['b1']+'|'+board['b2']+'|'+board['b3']+'|'+board['b4'])
    print('-+-+-+-')
    print(board['c1']+'|'+board['c2']+'|'+board['c3']+'|'+board['c4'])
    print('-+-+-+-')
    print(board['d1']+'|'+board['d2']+'|'+board['d3']+'|'+board['d4'])

You could also optimize your function by using a for loop:

def printboard(board):
    for v in ['a','b','c','d']:
        print('|'.join([board[f'{v}{i}'] for i in range(1,5)]))
        if v != 'd': print('-+-+-+-') # since you don't want this at last line

Edit: thanks to @Swifty

Answered By - The Myth

Answer Checked By - Robin (PHPFixing Admin)