Help me with a python program :

Implement a superclass appointment and subclasses Onetime, Daily and Monthly. An appointment has a description(for example, "See the dentist") and a date. Write a method occursOn(year, month, day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a list of appointment objects with a mixture of appointments. Have the user enter a date and print out all appointments that occur on that date.