code: def prepare_network(self):
          
          hydpy.pub.selections = selectiontools.Selections()
          hydpy.pub.selections += hydpy.pub.networkmanager.load_files()
          self.update_devices(hydpy.pub.selections.complete)
docs: Load all network files as |Selections| (stored in module |pub|)
          and assign the "complete" selection to the |HydPy| object.