code: def print_all_signals(self):
          
          for o in dir(self):
              obj= getattr(self, o)
              #print o, type(obj)
              div = False
              for c in dir(obj):
                  cobj = getattr(obj, c)
                  if isinstance(cobj, Signal):
                      print('def _on_{}__{}(self):'.format(o, c))
                      div = True
  
              if div: print('-'*30)
docs: Prints out every signal available for this widget and childs.