python - Sharing controller between views -

i have frame holds 2 views. want use common controller both of them not instantiate 2 controllers. how achieve this? singleton? send controller argument?

note, controller hold temporary data (bad idea?) sent away on command. that's why want 1 controller object. don't shy suggest other design ideas.

first view

class viewalpha     def __init_(self, parent):         self.controller = controller()      def on_click(self, event):         self.controller.do_this(event.data) 

second view

class viewbeta     def __init_(self, parent):         self.controller = controller()      def on_click(self, event):         self.controller.do_this(event.data) 

controller

class controller     def __init_(self):         self.client = client()      def do_this(self, data):         self.client.store(data) 

passing things arguments, in code, common solution problems this. if need do_this -method, can pass method:

beta = viewbeta(controller.do_this)