class CarRecord:                    # declaring a class without other methods
  def init (self):                # constructor
    self .VehicleID = ""
    self.Registration = ""
    self.DateOfRegistration = None
    self.EngineSize = 0
    self.PurchasePrice = 0.00

import pickle                       # this library is required to create binary f iles
ThisCar = CarRecord()
Car = [ThisCar for i in range (100)]

CarFile = open ('Cars.DAT', 'wb')   # open file for binary write

for i in range (100) :              # loop for each array element
    pickle.dump (Car[i], CarFile)   # write a whole record to the binary file

CarFile.close() # close file

CarFile = open( 'Cars.DAT','rb')    # open file for binary read
Car = []                            # start with empty list
while True:                         # check for end of file
    Car.append(pickle.load(CarFile))# append record from file to end of l i st

CarFile.close()