代理模式

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import time 


class SalesManager:
    def work(self):                         
        print("Sales Manager working...")             

    def talk(self):                         
        print("Sales Manager ready to talk") 


class Proxy:
    def __init__(self):                         
        self.busy = 'No'                         
        self.sales = None             

    def work(self):
        print("Proxy checking for Sales Manager availability")                         
        if self.busy == 'No':                                      
            self.sales = SalesManager()                                      
            time.sleep(2)
            self.sales.talk()                         
        else:                                      
            time.sleep(2)
            print("Sales Manager is busy")


if __name__ == '__main__':
    p = Proxy()
    p.work()
    p.busy = 'Yes'
    p.work()