Eric and I worked on the project today. We changed Ben's code.
The grid was displaying the sudoku inverse way, so we changed it.
In addition, x = column, y = row. In cell.py, we added a cell for
'.' Also in grid.py, the replace function was giving the neighbors
function numbers from 0 to 8, and it needed to be 1 to 9, so we
corrected. In search3x3.py, we created row, column, and sector checks to make sure that an element on the board is valid.