用于把一组相似的对象当成一个对象来使用

使用场景

  1. ceo > manager > employee
  2. 文件夹与文件，属性菜单

Demo

  1. """
  2. 组合模式
  3. """
  6. class Employee:
  7.     def __init__(self, name, age):
  8.         self.name = name
  9.         self.age = age
  10.         self.subordinates = []
  12.     def add(self, e):
  13.         self.subordinates.append(e)
  15.     def remove(self, e):
  16.         self.subordinates.remove(e)
  18.     def display(self):
  19.         for subordinate in self.subordinates:
  20.             print(f'my name is {subordinate.name}, age is {subordinate.age}')
  21.             if subordinate.subordinates:
  22.                 subordinate.display()
  25. if __name__ == '__main__':
  26.     ceo = Employee('ceo', 22)
  27.     m1 = Employee('m1', 20)
  28.     m2 = Employee('m2', 23)
  29.     ceo.add(m1)
  30.     ceo.add(m2)
  31.     e1 = Employee('e1', 18)
  32.     m1.add(e1)
  33.     ceo.display()