设计一个名为Stock的类来表示一个公司的股票，包括以下内容： 1）股票代码、股票名称、前一天股票价格、当天股票价格4个私有属性； 2）构造方法，需初始化代码、名称、前一天价格和当天价格等属性； 3）返回股票名字的get方法; 4）返回股票代码的get方法; 5）获取和设置股票前一天价格的get和set方法; 6）获取和设置股票当前价格的get和set方法; 7）名为getChangePercent()方法，返回前日收市价至当前价格的变化百分比； 8). 包括文档字符串，其内容为:"Stock Information Class" 说明：各方法的名称及参数要求请参见测试程序。 【样例输入】 601318 Chinese PINAN 63.21 64.39 【样例输出】 Code:601318 Name:Chinese PINAN Price/Yesterday:63.21 Price/Today:64.39 Edit Price/Yesterday To:50.25 Price Change Percentage:28.14% Stock Information Class #class Stock sCode = input() #Stock Code sName = input() #Stock Name priceYesterday = float(input()) #Price/Yesterday priceToday = float(input()) #Price Today s = Stock(sCode,sName,priceYesterday,priceToday) print("Code:",s.getCode()) print("Name:",s.getName()) print("Price/Yesterday:%.2f\nPrice Today:%.2f" % (s.getPriceYesterday(),s.getPriceToday())) s.setPriceYesterday(50.25) print("Edit Price/Yesterday To:%.2f" % 50.25) print("Price Change Percentage:%.2f%%" % (s.getChangePercent()*100)) print(Stock.__doc__)

代码如下：

class Stock:
    """Stock Information Class"""
    def __init__(self, code, name, priceYesterday, priceToday):
        self.__code = code
        self.__name = name
        self.__priceYesterday = priceYesterday
        self.__priceToday = priceToday

    def getName(self):
        return self.__name

    def getCode(self):
        return self.__code

    def getPriceYesterday(self):
        return self.__priceYesterday

    def setPriceYesterday(self, priceYesterday):
        self.__priceYesterday = priceYesterday

    def getPriceToday(self):
        return self.__priceToday

    def setPriceToday(self, priceToday):
        self.__priceToday = priceToday

    def getChangePercent(self):
        return (self.__priceToday - self.__priceYesterday) / self.__priceYesterday

sCode = input("Stock Code: ")
sName = input("Stock Name: ")
priceYesterday = float(input("Price/Yesterday: "))
priceToday = float(input("Price Today: "))

s = Stock(sCode, sName, priceYesterday, priceToday)

print("Code:", s.getCode())
print("Name:", s.getName())
print("Price/Yesterday: %.2f\nPrice Today: %.2f" % (s.getPriceYesterday(), s.getPriceToday()))

s.setPriceYesterday(50.25)
print("Edit Price/Yesterday To: %.2f" % 50.25)
print("Price Change Percentage: %.2f%%" % (s.getChangePercent() * 100))

print(Stock.__doc__)

输入样例：

601318
Chinese PINAN
63.21
64.39

输出样例：

Code: 601318
Name: Chinese PINAN
Price/Yesterday: 63.21
Price Today: 64.39
Edit Price/Yesterday To: 50.25
Price Change Percentage: 28.14%
Stock Information Class