class Stock:
    
    def __init__(self, code='Stock', entityType='Stock',
                 price=100., riskfreeRate=0.02, dividendYield=0.):
        self.code = code
        self.entityType = 'Stock'
        
        self.price = float(price)
        self.riskfreeRate = float(riskfreeRate)
        self.dividendYield = float(dividendYield)
        
    def serialize(self):
        return {
                "code": self.code,
                "entityType": self.entityType,
                "price": self.price,
                "riskfreeRate": self.riskfreeRate,
                "dividendYield": self.dividendYield,
                }