def update(self, module_name=None):
        """
        Update a module.  If module_name is supplied the module of that
        name is updated.  Otherwise the module calling is updated.
        """
        if not module_name:
            return self._module.force_update()
        else:
            module_info = self._get_module_info(module_name)
            if module_info:
                module_info["module"].force_update()

        Update a module.  If module_name is supplied the module of that
        name is updated.  Otherwise the module calling is updated.
        
py3status/py3.py