OOP Concept: Objects in Programming

Python Class and Object Interaction

• A Python class named test is defined with an __init__ method (constructor) that takes an optional argument a with a default value "Hello World".
• The __init__ method initializes the a attribute of the object with the default value if no argument is provided.
• The display method is defined to print the value of the a attribute.
• When an instance of the class is created, the __init__ method is called, assigning the default value "Hello World" to the a attribute if no argument is provided.
• The display method is then called on the object instance, printing the value of the a attribute, which is "Hello World".
• The output of the code is "Hello World".

Object-Oriented Programming Concepts

• An object represents a real-world entity with its identity and behavior.
• A constructor is used to create an object.

Methods and Constructors

• A constructor is a special method used to initialize objects.
• A constructor can have default arguments.

Python Code Example

• The code defines a class test with a constructor __init__ that takes a default argument a set to "Hello World".
• The constructor assigns the default value to the a attribute of the object.
• The display method prints the value of the a attribute.
• When an instance of the class is created, the constructor automatically assigns the default value to the a attribute.
• The display method prints the value of the a attribute, which is "Hello World" in this case.