举例分析Python中设计模式之外观模式的运用

class ModuleOne(object):
  def Create(self):
    print 'create module one instance'

  def Delete(self):
    print 'delete module one instance'

class ModuleTwo(object):
  def Create(self):
    print 'create module two instance'

  def Delete(self):
    print 'delete module two instance'

class Facade(object):
  def __init__(self):
    self.module_one = ModuleOne()
    self.module_two = ModuleTwo()

  def create_module_one(self):
    self.module_one.Create()

  def create_module_two(self):
    self.module_two.Create()

  def create_both(self):
    self.module_one.Create()
    self.module_two.Create()

  def delete_module_one(self):
    self.module_one.Delete()

  def delete_module_two(self):
    self.module_two.Delete()

  def delete_both(self):
    self.module_one.Delete()
    self.module_two.Delete()

class small_or_piece1: 
  def __init__(self): 
    pass 
   
  def do_small1(self): 
    print 'do small 1' 
   
class small_or_piece_2: 
  def __init__(self): 
    pass 
   
  def do_small2(self): 
    print 'do small 2' 
   
class small_or_piece_3: 
  def __init__(self): 
    pass 
   
  def do_small3(self): 
    print 'do small 3' 
 
class outside: 
  def __init__(self): 
    self.__small1 = small_or_piece1() 
    self.__small2 = small_or_piece_2() 
    self.__small3 = small_or_piece_3() 
   
  def method1(self): 
    self.__small1.do_small1()  ##如果这里调用的不只2两函数，作用就显示出来了，可以把原本复杂的函数调用关系清楚化，统一化 
    self.__small2.do_small2() 
     
  def method2(self): 
    self.__small2.do_small2() 
    self.__small3.do_small3() 
 
if __name__ == '__main__': 
  osd = outside() 
  osd.method1() 
  osd.method2() 

do small 1 
do small 2 
do small 2 
do small 3