def setItem(self, x, y, value):
        """ Set the value at point (x,y) to 'value' """

        h = self._height
        
        self.validatePoint((x,y))
        row = self._rows[h-y-1]
        row[x] = value
 Set the value at point (x,y) to 'value' 
recipes/Python/496884_Amaze__objectoriented_maze_generatorsolver/recipe-496884.py