python类的组合应用

class Employee:
    def __init__(self,name,salary = 0):
        self.name = name
        self.salary = salary
    def giveRaise(self,percent):
        self.salary = self.salary + (self.salary * percent)
    def work(self):
        print self.name,' does stuff'
    def __repr__(self):
        return '' % (self.name,self.salary)
    
class Chef(Employee):
    def __init__(self,name):
        Employee.__init__(self,name,50000)
    def work(self):
        print self.name,'makes food'

class Server(Employee):
    def __init__(self,name):
        Employee.__init__(self,name,40000)
    def work(self):
        print self.name, ' interfaces with customer'
class PizzaRobot(Chef):
    def __init__(self,name):
        Chef.__init__(self,name)
    def work(self):
        print self.name,' makes pizza'
        

class Customer:
    def __init__(self,name):
        self.name = name
    def order(self,server):
        print self.name,' order from ',server
    def pay(self,server):
        print self.name,' pays for item to ', server

class Oven:
    def bake(self):
        print 'oven bakes'

class PizzaShop:
    def __init__(self):
        self.server = Server('Pat')
        self.chef = PizzaRobot('Bob')
        self.oven = Oven()
    
    def order(self,name):
        customer = Customer(name)
        customer.order(self.server)
        self.chef.work()
        self.oven.bake()
        customer.pay(self.server)
if __name__ == '__main__':
    scene = PizzaShop()
    scene.order('Homer')
    print '...'
    scene.order('Shaggy')

输出：

Homer  order from  
Bob  makes pizza
oven bakes
Homer  pays for item to  
...
Shaggy  order from  
Bob  makes pizza
oven bakes
Shaggy  pays for item to