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Python Dates and Times in Python (2014) Let's Build a Timed Quiz App The Question Classes & the Plan

Yongyut Ruangsirinusorn
PLUS
Yongyut Ruangsirinusorn
Courses Plus Student 4,008 Points
Posted by Yongyut Ruangsirinusorn
Yongyut Ruangsirinusorn
Courses Plus Student 4,008 Points

Why both class attributes and instance attributes are in the classes?

I saw Kenneth had both 'questions = []', class attributes, and 'self.questions', instance attributes, in Quiz class. But I don't understand why. Also in questions.py, he used 'answer = None' and 'text = None' but in Add and Multiply class he used self.answer and self.text instead. Are class attributes in this scenario necessary? Thank you.