Classes & OOP

Question 1

Whats the difference of ‘==’ operator and is ‘?

Answer 1

’=’ checks if the objects are the same from a value perspective.
On the other hand, the is operator check if they point to the same memory location

Question 2

Which are the benefits of defining a custom exception classtype?

Answer 2

a) code maintanable

b) error cases to stand out

Question 3

What assigning does in python?

Answer 3

Assigning in python only binds names to an object. For immutable objects, that does not make any difference.

Question 4

How shallow copy takes place in mutable objects like lists,dictionaries and sets?

Answer 4

It is happened by calling its factory functions.

Question 5

What is a shallow copy?

Answer 5

It is the process of constructing a new collection of objects but then keeping the references to the children objects found on the original. It is an one level only clone.

Question 6

What is deep copy?

Answer 6

It is the process where a collection of objects is generated and then for each object a new copy of the original object is made. So, with this procedure, the whole object tree is traversed.
We’re going to create a deep copy using the deepcopy() function defined in the copy module instead

Question 7

For what abstract base classes are good for?

Answer 7

They are good for because it ensure that every subclass will implement all the methods of the base class.
Particularly for implementation we use ABC which reassures
a) a subclass wont be instantiated until all the base class methods are defined
b) base class cannot be instantiated

from abc import ABCMeta, abstractmethod 
class Base( metaclass = ABCMeta)