Class is a blueprint for creating objects with common attributes and behaviors. To define a class, use the class keyword followed by the class name. Self refers to the instance of the class. Objects are created by calling the class and passing arguments to its __init__ method. Attributes of an object can be accessed using the dot operator with the object, while class variables use the class name.

1. OBJECT ORIENTED CONCEPT
• UNIT 3: STRUCTUTRE
• Class & Object
• Inheritance
• Polymorphism
• Method Overloading
• Method Overriding

2. Class & Object:
• Classes are a way of aggregating similar data and functions. A
class is a scope inside which various code (especially function
definations) is executed, and the locals to this scope become
attributes of the class, and any objects constructed by this class.
An object constructed by a class is called an instance of that class.

3. Class & Object:
Defining a Class
To define a class, use the following format:
class ClassName:
"Here is an explanation about your class"
pass
The capitalization in this class definition is the convention but is not required by the
language. The pass statement in the code above is just to say to the python
interpreter just go on and do nothing. You can remove it as soon as you are adding
your first statement

4. Create a class
To create a new class definition in python, use the class statement.
Here is the general form to define a class in python:
class class_name:
'class doc string'
class_suite
Here, the class has a documentation string (docstring) that can be accessed
via the class_name._doc_, and the class_suite consists of all the component
statements defining the class members, data attributes, and functions.

5. Create a class
Let's take a look at this example, defining a class, STUDENT, in python:
class STUDENT:
'Common base class for all employees'
totalStudent = 0
def __init__(self, name, fee):
self.name = name
self.fee = fee
STUDENT.totalStudent = STUDENT.totalStudent + 1 def
displayCount(self):
print("Total Student = %d" % STUDENT.totalStudent)
def displayStudent(self):
print("Name:", self.name, ", Fee:", self.fee)

6. Create Instance Objects in Python
To create an instance of a class, you simply call the class using the class
name and then pass in whatever arguments its _init_ method accepts.
Here is an example.
stud1=STUDENT ("Devraj",2500)#created first object of STUDENT
class
stud2=STUDENT("Alok",2150)#created second object of STUDENT
class
stud3=STUDENT("Satyam",3200)#created third object of
STUDENT class

7. Access Attributes in Python
You can access the attributes of the object just by using the dot (.)
operator with object. Class variable can be access by using the class
name. Here is an example.
stud1.displayStudent()
stud2.displayStudent()
stud3.displayStudent()
print("Total Student = %d" % STUDENT.totalStudent)