Program debugging (python)

[abdullahali]

I don't get that error. I get a later error on line 11, because you never convert the strings to integers. I think you want to replace the str call on line 47 to an int call. And you need to be careful about your input. If you don't input 9 numbers with spaces in between them, you'll get the error you got.

I replace str with int and now the line looks like this.
square[i].append(int(str_list[j + i * N]))
However, when i input 1 2 3 4 5 6 7 8 9 i get this error: for line 11
TypeError: unsupported operand type(s) for +: 'int' and 'str'