oop

Question 1

What is DRY?

Answer 1

Don’t repeat yourself. It is part of the OOD principles and encourages code reuse.

Question 2

What is the dot ‘.’ when working with classes

Answer 2

The access modifier which allows us to access attributes and call methods on an aobject

Question 3

How do you check if a specific object is of a specific type?

Answer 3

isinstance(object, type)

print(isinstance(baby, Person)) # Should print True
print(isinstance(baby, object)) # Should print True

Question 4

Is Python an Object Oriented Language

Answer 4

Python is object oriented under the hood but it’s not an object oriented first language

Question 5

What is duck-typing also known as

Answer 5

Polymorphism

Question 6

What is polymorphism/duck-typing

Answer 6

Where the interface to the object determines how it is to be used

Question 7

What is the design principle that encapsulates OOD design principles

Answer 7

SOLID

Question 8

What are the SOLID stages?

Question 9

What is the Open-Closed Principle?

Answer 9

A class should have only one reason to change
A reason = an actor
A module, a class, or a method should be responsible for a SINGLE FUNCTIONALITY of a software system

Question 10

what is an actor?

Answer 10

pysical actors (people), or an abstarct actor (a component of your software)

Question 11

How to spot SRP violations?

Answer 11

Is the class serving more than one actor?
Do the functionalities of the class serve the same actor??
Is the class responsible for many functionalities?