class CarRecord:
    def __init__(self):
        self.VehicleID = ''
        self.Registration = ''
        self.DateOfRegistration = None
        self.EngineSize = 0
        self.PurchasePrice = 0.00

ThisCar = CarRecord()
ThisCar.EngineSize = 2500

ThisCar = CarRecord()
Car = [ThisCar for i in range(100)]
Car[1].EngineSize = 2500