外观模式
Facade模式其实就是把一些工作接口，根据一定的组合提供一些接口，比如你有1,2,3,4四种功能，你提供的接口一调用了123,接口二调用了124,接口三调用了34,这样的方式
python的例子
class Test1(object):
def run(self):
print "###### In Test 1 ######"
class Test2(object):
def run(self):
print "###### In Test 2 ######"
class Test3(object):
def run(self):
print "###### In Test 3 ######"
class Runner(object):
def __init__(self):
self.t1 = Test1()
self.t2 = Test2()
self.t3 = Test3()
def build_up1(self):
[i.run() for i in [self.t1, self.t3]]
def build_up2(self):
[i.run() for i in [self.t3, self.t2]]
def build_up3(self):
[i.run() for i in [self.t3, self.t2, self.t1]]
if __name__ == '__main__':
run = Runner()
# 不同的组合
run.build_up1()
run.build_up2()
run.build_up3()
