Python父与子的编程之旅第十四章答案

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#Python #父与子的编程之旅 # 第十四章答案

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本文介绍了一个简单的银行账户管理系统，包括基本的存款、取款和显示余额功能，并进一步扩展到具有利息计算功能的账户类型。通过继承和多态展示了面向对象编程在处理复杂业务逻辑中的应用。

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14-1

class Bankcount:
    def __init__(self,countname,countnum):
        self.countname = countname
        self.countnum = countnum
        self.balance = 0.0
    def __str__(self):
        msg = "your countname is " + self.countname + "\n"\
            "your countnum is " + self.countnum + "\n"\
            "your balance is " + str(self.balance)
        return msg
    def Balance(self):
        print(self.balance)
    def AddMoney(self,money):
        self.balance += money
    def TakeMoney(self,money):
        if money > self.balance:
            print("sorry,you balance is not satified")
        else:
            self.balance -= money

mycount = Bankcount("peng","19920402")
mycount.AddMoney(100)
mycount.TakeMoney(20)
print(mycount)

14-2

class Bankcount:
    def __init__(self,countname,countnum):
        self.countname = countname
        self.countnum = countnum
        self.balance = 0.0
    def __str__(self):
        msg = "your countname is " + self.countname + "\n"\
            "your countnum is " + self.countnum + "\n"\
            "your balance is " + str(self.balance)
        return msg
    def Balance(self):
        print(self.balance)
    def AddMoney(self,money):
        self.balance += money
    def TakeMoney(self,money):
        if money > self.balance:
            print("sorry,you balance is not satified")
        else:
            self.balance -= money

class InterestAcount(Bankcount):
    def __init__(self,countname,countnum):
        Bankcount.__init__(self,countname,countname)
        self.interestrate = 0.006
        self.interest = 0

    def addInterest(self):
        self.interest = self.balance * self.interestrate
        self.balance += self.interest

mycount = InterestAcount("peng","19920402")
mycount.AddMoney(100)
mycount.TakeMoney(20)
mycount.addInterest()
print(mycount)

mycount.AddMoney(1000)
mycount.TakeMoney(200)
mycount.addInterest()
print(mycount)