#NEWLINE# def register_predicate_fallback( self , dispatch , func , fallback_func ) : #NEWLINE# #INDENT# 'Register a predicate fallback for installation into reg registry.\n\n        See :meth:`morepath.App.predicate_fallback` for details.\n\n        :param dispatch: the dispatch function to register fallback on.\n        :param func: the predicate function to register fallback for.\n        :param fallback_func: the fallback function.\n        ' #NEWLINE# self . _predicate_fallbacks . setdefault ( dispatch , { #NEWLINE# #INDENT# #NEWLINE# #UNINDENT# } ) [ func ] = fallback_func