def getAllZeroPoints(self):
        """ Return a list of all points with
        zero value """
        
        points = []
        for x in range(self._width):
            for y in range(self._height):
                if self.getItem(x,y)==0:
                    points.append((x,y))

        return points
 Return a list of all points with
        zero value 
recipes/Python/496884_Amaze__objectoriented_maze_generatorsolver/recipe-496884.py