Python - Object-Oriented Programming - Class Attribute Versus Object Attribute

This video tutorial explains the concept of class attributes in object-oriented programming, particularly in Python. It distinguishes between instance and class attributes, demonstrating how class attributes are shared across all instances of a class. The tutorial provides examples using a bank account class, showing how to define, access, and modify class attributes. It also covers using class attributes within methods and tracking the number of objects created from a class.

What is a key difference between class attributes and instance attributes?

• Class attributes are unique to each object.

• Instance attributes are shared across all instances.

• Instance attributes are defined outside the class.

• Class attributes are shared across all instances.

In the BankAccount class example, which attribute is shared by all instances?

• Account number

• Holder

• Balance

• Interest rate

How can you access a class attribute in Python?

• By using a special keyword

• Through both the class name and an instance

• Only through an instance of the class

• Only through the class name

What happens when you modify a class attribute?

• It only affects the instance that made the change.

• It affects all instances of the class.

• It creates a new attribute for the instance.

• It has no effect on any instance.

Why is it generally better to access a class attribute through the class name?

• It is the only way to access class attributes.

• It is faster than accessing through an instance.

• It prevents accidental modification of the attribute.

• It makes the code more readable and logical.

What is the purpose of the calculate_interest method in the BankAccount class?

• To change the interest rate

• To calculate the interest for one month

• To update the balance of the account

• To print the account details

How is the population attribute used in the BankAccount class?

• To store the interest rate for each account

• To store the total balance of all accounts

• To calculate the interest for each account

• To keep track of the number of accounts created