code: def add_places(self, places, ret=False):
          
          if type(places) != list: places = [places]        
          self.places += places
          if ret: return self
docs: Add ``pyny.Places`` to the current space.
          
          :param places: Places to add.
          :type places: list of pyny.Place
          :param ret: If True, returns the whole updated Space. 
          :type ret: bool
          :returns: None, ``pyny.Space``
          
          .. warning:: This method acts inplace.