In general, when classes are grouped into inheritance hierarchy, the common code is written in super class, such that it can be shared in all sub classes. Let's take an example of Quiz to explain ...

Decision Structures and Boolean Logic 4: Repetition Structures 5: Functions 6: Files and Exceptions 7: Lists and Tuples 8: More About Strings 9: Dictionaries and Sets 10: Classes and Object-Oriented ...