code: def get(self, attr):
          
          if self._attr:
              ret = self._attr.copy()
              if attr:
                  ret.update(attr)
              return ret
          else:
              return attr if attr else {}
docs: Get the attribute dict given the attribute set by the symbol.
  
          Parameters
          ----------
          attr : dict of string to string
              The attribute passed in by user during symbol creation.
  
          Returns
          -------
          attr : dict of string to string
              Updated attributes to add other scope related attributes.