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

好的，以下是符合要求的 Python 代码实现：

class Stock:
    """
    Stock Information Class
    """
    def __init__(self, code, name, yesterday_price, today_price):
        self.__code = code
        self.__name = name
        self.__yesterday_price = yesterday_price
        self.__today_price = today_price
        
    def get_name(self):
        """
        Get the name of the stock
        
        Returns:
        str: the name of the stock
        """
        return self.__name
    
    def get_code(self):
        """
        Get the code of the stock
        
        Returns:
        str: the code of the stock
        """
        return self.__code
    
    def get_yesterday_price(self):
        """
        Get the yesterday price of the stock
        
        Returns:
        float: the yesterday price of the stock
        """
        return self.__yesterday_price
    
    def set_yesterday_price(self, price):
        """
        Set the yesterday price of the stock
        
        Args:
        price (float): the yesterday price of the stock
        """
        self.__yesterday_price = price
    
    def get_today_price(self):
        """
        Get the today price of the stock
        
        Returns:
        float: the today price of the stock
        """
        return self.__today_price
    
    def set_today_price(self, price):
        """
        Set the today price of the stock
        
        Args:
        price (float): the today price of the stock
        """
        self.__today_price = price
    
    def getChangePercent(self):
        """
        Get the change percentage of the stock price
        
        Returns:
        str: the change percentage of the stock price
        """
        change_percent = (self.__today_price - self.__yesterday_price) / self.__yesterday_price * 100
        return "{:.2f}%".format(change_percent)
    
    
# 测试程序
code, name, yesterday_price, today_price = input().split()
stock = Stock(code, name, float(yesterday_price), float(today_price))
print("Code:{} Name:{} Price/Yesterday:{} Price/Today:{} Edit Price/Yesterday To:{}".format(
    stock.get_code(), stock.get_name(), stock.get_yesterday_price(), stock.get_today_price(), 50.25))
stock.set_yesterday_price(50.25)
print("Price Change Percentage:{}".format(stock.getChangePercent()))

你可以将这段代码复制到 Python 环境中运行，输入样例输入进行测试。