code: def _set_pixel(self, x, y, color):
          
          if not self.is_in_bounds(x, y):
              return
          rgb = self._convert_rrggbb_to_image_color(color)
          x -= self._min_x
          y -= self._min_y
          self._image.putpixel((x, y), rgb)
docs: set the color of the pixel.
  
          :param color: must be a valid color in the form of "#RRGGBB".
            If you need to convert color, use `_set_pixel_and_convert_color()`.