Python events & triggers

Question

Is there a way to trigger CHILD objects in Python? So what I mean:

class A(object):
  def a(self):
    print("Hello from A")
    # ???

class B(A)
  def b(self):
    print("Now in B")

and I need to trigger the b() function from class A, and A only "knows" that B class extends to it

I want to use it for events in something like plugins, so there will be some modules with classes which extends main class, from which I'll trigger events in plugins

Answer 1

You can define an abstract plugin type as an interface for which function can be called:

class AbstractPlugin(object):
  def trigger(self):
    pass

class APlugin(AbstractPlugin):
  def trigger(self):
    print("This is plugin A")

class BPlugin(AbstractPlugin):
  def trigger(self):
    print("This is plugin B")

With your class A, you could do stuff like this:

class A(object):
  def a(self, plugin: AbstractPlugin):
    print("Hello from A")
    plugin.trigger()

master = A()
plugin_a = APlugin()
plugin_b = BPlugin()

master.a(plugin_a)
master.a(plugin_b)

This will result in:

Hello from A
This is plugin A
Hello from A
This is plugin B