Initialise the game grid

def initGrid(self):
        """
        Initialise the game grid
        """
        blinker = [(4, 4), (4, 5), (4, 6)]
        toad = [(9, 5), (9, 6), (9, 7), (10, 4), (10, 5), (10, 6)]
        glider = [(4, 11), (5, 12), (6, 10), (6, 11), (6, 12)]
        r_pentomino = [(10, 60), (9, 61), (10, 61), (11, 61), (9, 62)]

        self.grid = {}

        if self.test:
            for cell in chain(blinker, toad, glider, r_pentomino):
                self.grid[cell] = 1
        else:
            for _ in range(self.initsize):
                ry = random.randint(self.y_pad, self.y_grid - 1)
                rx = random.randint(self.x_pad, self.x_grid - 1)
                self.grid[(ry, rx)] = 1