open_and_close_observation_pattern.py

from turtle import mainloop
from unittest import main


class Observable:
    def __init__(self):
        self._observers = []

    def register_observer(self, observer):
        self._observers.append(observer)

    def notify_observers(self, *args, **kwargs):
        for obs in self._observers:
            (name, b, x) = args

            if obs.name == name:
                obs.fire_event(self, *args, **kwargs)


class Observer:
    def __init__(self, observable):

        observable.register_observer(self)

    def fire_event(self, observable, *args, **kwargs):
        pass


class PurgeObserver(Observer):
    def __init__(self, observable):
        self.name = "PurgeObserver"
        super(PurgeObserver, self).__init__(observable)

    def fire_event(self, observable, *args, **kwargs):
        print("purge fire")


class NotifyObserver(Observer):
    def __init__(self, observable):
        self.name = "NotifyObserver"
        super(NotifyObserver, self).__init__(observable)

    def fire_event(self, observable, *args, **kwargs):
        print("send a email")


class EventManagement:
    def __init__(self):

        self.observable = Observable()
        self.purge_observer = PurgeObserver(self.observable)
        self.notify_observer = NotifyObserver(self.observable)


event_management = EventManagement()
event_management.observable.notify_observers("PurgeObserver", "b", "x")
event_management.observable.notify_observers("PurgeObserver", "b", "x")