示例:

    1. from common import Observer, Observable
    3. class Boss(Observer):
    5.     def __init__(self, name):
    6.         self.name = name
    8.     def update(self, observable, *args, *kwargs):
    9.         print("%s recive %s work report: %s" % (self.name, args[1], args[2]))
    11. class Employee(Observable):
    13.     def __init__(self, name):
    14.         self.name = name
    16.     def submit_work_report(self, report):
    17.         self.notifyObservers(self, self.name, report)
    19. Henry = Boss("Henry")
    20. Tony = Employee("Tony")
    21. Jimmy = Employee("Jimmy")
    22. Tony.addObserver(Henry)
    23. Jimmy.addObserver(Henry)
    24. Tony.submit_work_report("2000-01-01 work over")
    25. # Henry recive Tony work report: 2000-01-01 work over
    26. Jimmy.submit_work_report("2000-01-01 work deferral")
    27. # Henry recive Jimmy work report: 2000-01-01 work deferral
    29. Jimmy.delObserver(Henry)
    30. Leaf = Boss("Leaf")
    31. Jimmy.addObserver(Leaf)
    32. Jimmy.submit_work_report("2001-01-01 work over")
    33. # Leaf recive Jimmy work report: 2001-01-01 work over