code: def set(self, x, y):
          
          x = normalize(x)
          y = normalize(y)
          col, row = get_pos(x, y)
  
          if type(self.chars[row][col]) != int:
              return
  
          self.chars[row][col] |= pixel_map[y % 4][x % 2]
docs: Set a pixel of the :class:`Canvas` object.
  
          :param x: x coordinate of the pixel
          :param y: y coordinate of the pixel