def _get_xqueue_callback_url_prefix(xmodule_instance_args):
 return (xmodule_instance_args.get('xqueue_callback_url_prefix', '') if (xmodule_instance_args is not None) else '')

def _get_xqueue_callback_url_prefix ( xmodule_instance_args ) : return ( xmodule_instance_args . get ( 'xqueue_callback_url_prefix' , '' ) if ( xmodule_instance_args is not None ) else '' )
gets prefix to use when constructing xqueue_callback_url .