Classes and Objects in Python

A class is the blueprint. An object is one real thing made from it. class Student: is the idea of a student. s = Student("Asha", 12) is one student sitting in the room. Two objects can have different names and rolls.

__init__ runs when you create the object. self is that object. self.name = name stores the field on it. Forget self and you get TypeError or a variable that vanishes. Every method’s first parameter is self — you don’t pass it at the call site.

Let’s take this on the board. class Student with __init__(self, name, roll). s = Student("Asha", 12). print(s.roll, s.name) → 12 Asha. Class is Student. Object is s. That is the whole idea for a fresher viva.

Classes and Objects in Python — output — 12 Asha. Student is the class; s is one real object.