A class is a user-defined blueprint or prototype from which objects are created. Classes provide a means of bundling data and functionality together. Creating a new class creates a new type of object, allowing new instances of that type to be made

Syntax:
class class_name:
statements

How to define class objects

An Object is an instance of a Class. A class is like a blueprint while an instance is a copy of the class with actual values.
An object consists of :

State: It is represented by the attributes of an object. It also reflects the properties of an object.
Behavior: It is represented by the methods of an object. It also reflects the response of an object to other objects.
Identity: It gives a unique name to an object and enables one object to interact with other objects

Syntax:
Object_name.class_name()

Program



Output

graduate
I'm a graduate
I'm a student

The self method

Class methods must have an extra first parameter in the method definition. We do not give a value for this parameter when we call the method, Python provides it.
If we have a method that takes no arguments, then we still have to have one argument.
When we call a method of this object as myobject.method(arg1, arg2), this is automatically converted by Python into MyClass.method(myobject, arg1, arg2)

init method

The init method is similar to constructors in C++ and Java. Constructors are used to initializing the object’s state. It runs as soon as an object of a class is instantiated. The method is useful to do any initialization you want to do with your object.

Program



Output

Hello, my name is John

Class and Instance Variables:

Class variables is a variable that is shared by all instances of a class. They are defined within a class but outside any of the class's methods.

Instance Variable is a variable that is defined inside a method and belongs only to the current instance of a class.

Program



Output

myobj1 details:
myobj1 is a student
name: Harry
subject: Physics

Accessing class variable using class name
student