6-7【任务6-7】完整定义与使用1个父类Commodity和2个子类（Handset）

【任务6-7】完整定义与使用1个父类Commodity和2个子类（Book、Handset）【任务描述】（1）在项目Unit06创建Python程序文件6-7.py。（2）在程序文件6-7.py中完整定义与使用1个父类Commodity和2个子类（Book、Handset）。（3）综合应用类的属性与方法计算与输出应付金额、返现金额、优惠金额、运费和实付金额。【任务实施】在PyCharm项目Unit06中创建Python程序文件6-7.py。在程序文件6-7.py中编写程序代码，实现所需功能。编写定义父类Commodity及其多个属性、方法的代码。【任务实施】classCommodity:#定义父类的构造方法

def__init__(self,code="",name="",price=0.0,quantity=0):modityCode=codemodityName=namemodityPrice=pricemodityQuantity=quantity【任务实施】

#定义父类的实例属性

@propertydefcode(self):returnself._code@code.setterdefcode(self,value):self._code=value【任务实施】

@propertydefname(self):returnself._name@name.setterdefname(self,value):self._name=value【任务实施】

@propertydefprice(self):returnself._price@price.setterdefprice(self,value):self._price=value【任务实施】

@propertydefquantity(self):returnself._quantity@quantity.setterdefquantity(self,value):ifnotisinstance(value,int):raiseValueError('购买数量应为正整数!')self._quantity=value【任务实施】

@propertydefcalculateAmount(self):amount=modityPrice*modityNumberreturnamount@propertydefamount(self):amount=self.price*self.numberreturnamount【任务实施】defprintInfo(self,strInfo):print("{:^50s}".format(strInfo))defprintField(self,endMark="\n"):print("{:^9s}".format("商品编号"),end="")print("{:^20s}".format("商品名称"),end="")print("{:^12s}".format("价格"),end=endMark)【任务实施】defprintData(self,endMark="\n"):print("{:^10s}".format(self.code),end="")print("{:^21s}".format(),end="")print("{:^8.2f}".format(self.price),end=endMark)【任务实施】编写定义子类Book及其多个属性、方法的代码。#定义第1个子类BookclassBook(Commodity):def__init__(self,code="",name="",price=0.0,publisher="",editionOrder=1):Commodity.__init__(self,code,name,price)self.bookPublisher=publisherself.bookEdition=editionOrder【任务实施】

#定义子类Book的属性

@propertydefpublisher(self):returnself._publisher@publisher.setterdefpublisher(self,value):self._publisher=value【任务实施】

@propertydefedition(self):returnself._edition@edition.setterdefedition(self,value):self._edition=value【任务实施】defprintField(self):Commodity.printField(self,"")print("{:^7s}".format("出版社名称"),end="")print("{:^16s}".format("版次"))defprintData(self):Commodity.printData(self,"")print("{:^10s}".format(self.publisher),end="")print("{:^6d}".format(self.edition))【任务实施】

@classmethoddefgetDiscountPrice(cls,rank,price):ifrank=="PLUS":discountPrice=price*0.88else:ifrank=="FAN":discountPrice=price*0.90else:discountPrice=price*0.92returndiscountPrice【任务实施】@classmethoddefgetDiscount(cls,number,price):originalTotal=number*pricediscount=0iforiginalTotal>=299:discount=15.00returndiscount【任务实施】@classmethoddefgetCashback(cls,number,price):originalTotal=number*pricereduction=int(originalTotal/100)ifreduction>0:cashback=reduction*50returncashback【任务实施】@classmethoddefgetCarriage(cls,payable):#订单金额＜49，收取基础运费6元；订单金额≥49，收取基础运费0元

ifpayable<49:carriage=6.00else:carriage=0.00returncarriage【任务实施】

#输出结算数据

@classmethoddefprintSettlementData(cls,*data):print("应付金额：￥"+"{:.2f}".format(data[0]))print("运费：￥"+"{:.2f}".format(data[1]))print("返现金额：-￥"+"{:.2f}".format(data[2]))print("优惠金额：-￥"+"{:.2f}".format(data[3]))print("实付金额：￥"+"{:.2f}".format(data[4]))【任务实施】编写子类Handset及其多个属性、方法的代码。#定义第2个子类HandsetclassHandset(Commodity):def__init__(self,code="",name="",price=0.0,resolution="",screenSize=""):#在子类中使用supper()函数调用父类的__init__()方法super().__init__(self,code,name,price)self.handsetResolution=resolutionself.handsetScreenSize=screenSize【任务实施】

#定义子类Handset的属性

@propertydefresolution(self):returnself._resolution@resolution.setterdefresolution(self,value):self._resolution=value【任务实施】

@propertydefscreenSize(self):returnself._screenSize@screenSize.setterdefscreenSize(self,value):self._screenSize=value【任务实施】

defprintField(self):Commodity.printField(self,"")print("{:^6s}".format("屏幕尺寸"),end="")print("{:^16s}".format("物理分辨率"))【任务实施】defprintData(self):Commodity.printData(self,"")print("{:^20s}".format(self.screenSize),end="")print("{:^12s}".format(self.resolution))【任务实施】针对创建的类Commodity和两个子类Book、Handset实施以下各项操作。1．创建子类Book的实例对象book代码如下：book=Book()【任务实施】2．通过类的实例对象book给类的属性赋值代码如下：book.code="12563157"="给Python点颜色青少年学编程"book.price=59.80book.quantity=1book.publisher="人民邮电出版社"book.edition=1【任务实施】3．通过类的实例对象book以模拟表格方式输出图书数据代码如下：book.printField()book.printData()运行结果为：商品编号商品名称价格出版社名称版次12563157给Python点颜色青少年学编程59.80人民邮电出版社1【任务实施】4．通过类的实例对象book分别设置父类实例属性的值和用户等级代码如下：book.quantity=5rank="Ordinaryusers"【任务实施】5．调用类的多个方法分别计算应付金额、返现金额、优惠金额、运费和实付金额代码如下：discountPrice=book.getDiscountPrice(rank,book.price)discountAmount=book.quantity*discountPricediscount=book.getDiscount(book.quantity,book.price)cashback=book.getCashback(book.quantity,book.price)discountTotal=discount+cashbackpayable=discountAmount-discountTotalcarriage=book.getCarriage(payable)payable+=carriage【任务实施】6．调用子类book的方法printSettl