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  1. class Application:
  2.  
  3.     def __init__(self):
  4.         self.instanceA = ClassA(self)
  5.         self.instanceB = ClassB(self)
  6.  
  7.     def run(self):
  8.         self.instanceA.send_hello()
  9.         self.instanceB.send_hello()
  10.  
  11. class ClassA:
  12.     def __init__(self, app):
  13.         self.app = app
  14.  
  15.     def hello(self, sender):
  16.         print('A: Hello from {}'.format(sender)) 
  17.  
  18.     def send_hello(self):
  19.         self.app.instanceB.hello("A")
  20.  
  21. class ClassB:
  22.     def __init__(self, app):
  23.         self.app = app
  24.  
  25.     def hello(self, sender):
  26.         print('B: Hello from {}'.format(sender)) 
  27.  
  28.     def send_hello(self):
  29.         self.app.instanceA.hello("B")
  30.  
  31. app = Application()
  32. app.run()
Success #stdin #stdout 0.01s 9992KB
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Standard input is empty
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B: Hello from A
A: Hello from B
https://ideone.com/rpSIIG
language:
Python 3 (python  3.12)
created:
9 years ago
visibility:
public

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