Redraw the grid with the new generation

def drawGrid(self):
        """
        Redraw the grid with the new generation
        """
        for cell in self.grid:
            y, x = cell
            y += self.y_pad
            x += self.x_pad

            if self.traditional:
                sprite = '.'
                color = curses.color_pair(4)
            else:
                sprite = self.char[self.grid[cell] - 1]
                color = curses.color_pair(self.grid[cell])

            self.addchar(y, x, sprite, color)

        self.win.refresh()