code: def _get_slot(self):
          "Returns the next coordinates for a preview"
  
          x = y = 10
          for k, p in self.previews.items():
              y += p.height() + self.padding
          return x, f _get_slot(self):
          "Returns the next coordinates for a preview"
  
          x = y = 10
          for k, p in self.previews.items():
              y += p.height() + self.padding
          return x, y
docs: Returns the next coordinates for a preview