Howdoi? C# type "on_<property-name>" events and bind() - in pyton

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MVC

event

Python2.7

I am coming from a 'C'/unix background and learning Python. The kivy framework - for python - implements a wonderful event driven architecture, that I would like to replicate in my own app - but I'm not using Kivy due to reasons I shall avoid documenting here for sake of ease of dicsussion.

On kivy one can observe changes to a propery (set) using 'on_<property-name>'. The on_<property-name> is invoked through the hieratchy when the property value changes. If defining the class yourself:

from kivy import Widget

class MyClass(Widget):
   # I guess we need to start with EventDispatcher??

   my_property = NumericProperty(1) # NumbericProperty is a kivy class

   # This method can be overriden by base clases of this class
   def on_my_property(self, instance, value):
      # Note that 'on_<property-name>' must not forget to call
      # the superclass function 'on_<property>' also ,
      # but I do not know how to do this?
      super(MyClass, self).on.... ??

      print('My property a changed to', value)

How do I replicate this architecute?
I have looked at this Kivy source file for property class https://github.com/kivy/kivy/blob/master/kivy/properties.pyx#L219 but there is far far more going on than I need and it is difficult for me to undertand the code. I do not see how or where the "On_<property-name>" method/function/event (whatever it is called) is defined so that I can override it in MyClass

So in my design, I want a root class to be:

class MyProperty(object): # Is object correct?
  # I have no idea what to subclass from ?
  # or how to provide the on_<property-name> event?

So that I can subclass:

class MyModel(EventDispatcher): # Is this right???
   # declare property called "data"
   data=MyProperty(...) # not sure what to do here?

class MySubModel(MyModel): # Is Object right???
   # override super class MyModel's on_data event to react to changes to "data"
   def on_data():
      # some action code

But I have no idea how to implement this the on_<property> so that the superclass is called appropriately and on_<property> can be overriden by subclasses I define.

Help please , and don't forget to give the all important explanation. Please, PLEASE dont link me to google because clearly I have got to a point where I have googled and looked at sites and pages, and come here for help. And, PLEASE dont offer another solution because I've spent so long on this, that I must now understand and implement the same design patterns for sanity !! Thank you

What I have tried:

kivy/properties.pyx at master · kivy/kivy · GitHub[^]