class cust(object):
        def __init__(self,name,days):
                self.name = name
                self.days = days
        def getdays(self):
                return self.days
        def getname(self):
                return self.name

class delegate(cust):
        def __init__(self,name,days,course):
                super(delegate,self).__init__(name,days)
                self.course = course
        def getprice(self):
                return 100 + self.days * 250

class resident(cust):
        def __init__(self,name,days,number_in_room):
                super(resident,self).__init__(name,days)
                self.number_in_room = number_in_room
        def getprice(self):
                return self.days * (70 + 10 * self.number_in_room)
        def __add__(this,that):
                if isinstance(that,resident):
                        daze = this.days
                        if daze < that.days: daze = that.days
                        nr = resident(this.name + " & " + that.name, \
                                daze, this.number_in_room + that.number_in_room)
                        return nr
                else:
                        nr = resident(this.name , this.days + that, \
                                this.number_in_room)
                        return nr

if __name__ == "__main__":

        both = resident("Bill",3,1) + resident("Marj",2,1)
        both = both + 4

        customers = [delegate("John Swan",3,"Python Programming"),
                delegate("Bill Hill",4,"Learning to Prog in Python"),
                resident("Jo King",2,1) ,
                both,
                resident("Whip van Tinkle",3,2)]
        format = "%3d %20s %8.2f"
        for customer in customers:
                los = customer.getdays()
                whom = customer.getname()
                cost = customer.getprice()
                print format % (los, whom, cost)

""" Sample output
Dorothy-2:may10py grahamellis$ python whm3
  3 John Swan 850.00
  4 Bill Hill 1100.00
  2 Jo King 160.00
  7 Bill & Marj 630.00
  3 Whip van Tinkle 270.00
Dorothy-2:may10py grahamellis$

"""