Class

A class is like a form or a questionnaire. An instance is like a form that has been filled out with information. Just like many people can fill out the same form with their unique information, many instances can be created from a single class.

• Used to create user-defined data structures

Class Definition

class  Car :
	pass

• Usually written in CamelCase

• Example Class :

  class Car:
  	pass
  
  c= Car
  c.name = "Ferrari"
  c.topspeed = 400
  print(c.name)
  print(c.topspeed)
  

Constructor

• Assign values to the data member of the class at the time of object creation.
• methods with double underscores are known as dunder methods

def __init__(self):
    # body of the constructor

Self

• The first parameter in class declaration
• Can be also named as anything else but lets just keep it as self.
• refers to the current instance of class (whatever class object you decide to call)

class Car:
    def __init__(self, name, topSpeed):
          self.name = name 
          self.topSpeed= topSpeed

1. **self.name = name**creates an attribute called name and assigns to it the value of the name parameter.

2. self.topSpeed= topSpeed creates an attribute called topSpeed and assigns to it the value of the topSpeed parameter.

Example :