Python 3.6 (The Stock class) Design a class named Stock to represent a company\'

Question

Python 3.6

(The Stock class) Design a class named Stock to represent a company's stock that contains: A private string data field named symbol for the stock's symbol. A private string data field named name for the stock's name. A private float data field named previousClosingPrice that stores the stock price for the previous day. A private float data field named currentPrice that stores the stock price for the current time. A constructor that creates a stock with the specified symbol, name, previous price, and current price. A get method for returning the stock name. A get method for returning the stock symbol. Get and set methods for getting/setting the stock's previous price. Get and set methods for getting/setting the stock's current price. A method named getChangePercent() that returns the percentage changed from previousClosingPrice to currentPrice. Draw the UML diagram for the class, and then implement the class. Write a test program that creates a Stock object with the stock symbol INTC, the name Intel Corporation, the previous closing price of 20.5, and the new current price of 20.35, and display the price-change percentage. UML Diagram: Stock -symbol: str The symbol of this stock -name: str The name of this stock. - previousClosingPrice: float The previous closing price of this stock. -currentPrice: float The current price of this stock. Stock (symbol: str, name: str) Constructs a stock with a specified symbol and a name. getChange Percent(): float Returns the percentage of change of this stock. getSymbol(): str Returns the symbol of this stock getName(): str Returns the name of this stock. getPrevious ClosingPrice(): float Returns the previous closing price of this stock. set PreviousClosing Price (price: float): None Sets a new previous closing price of this stock. getCurrentPrice(): float Returns the current price of this stock. getCurrentPrice(price: float): None Sets a new current price of this stock.

Explanation / Answer

#save this file as stock.py and run the program on python terminal

#Stock class
class Stock:

#constructor
def __init__(self, symbol, name):
        self.symbol = symbol
        self.name = name
        self.previousClosingPrice = 0
        self.currentPrice =0

#getter and setter methods of class variables
def getChangePercent(self):
    return (self.currentPrice-self.previousClosingPrice)/self.previousClosingPrice

def getSymbol(self):
        return self.symbol

def getName(self):
        return self.name

def getPreviousClosingPrice(self):
    return self.previousClosingPrice;

def setPreviousClosingPrice(self,price):
    self.previousClosingPrice = price

def getCurrentPrice(self):
      return self.currentPrice

def setCurrentPrice(self, price):
    self.currentPrice = price

#create an object of stock class
stock = Stock("ONE", "ONE MEDIA Inc.")
#set stock closing price
stock.setPreviousClosingPrice(100);

#set stock price
stock.setCurrentPrice(90);
print("Display stock info")
print("Previous Closing Price: ",stock.getPreviousClosingPrice())
print("Current Price: ",stock.getCurrentPrice())
print("Price Change: ",stock.getChangePercent())

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Sample Output:

>>>
Display stock info
Previous Closing Price: 100
Current Price: 90
Price Change: -0.1

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