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Create Class & Object in Python

__init__ runs when you call Student(...). display_info is just a function with self already filled in.

BeginnerObject-Oriented ProgramsExample 1 of 25

create-class-object.py

1# Program to create a simple class and object
2
3class Student:
4    def __init__(self, name, roll_no):
5        self.name = name
6        self.roll_no = roll_no
7
8    def display_info(self):
9        print(f"Name: {self.name}, Roll No: {self.roll_no}")
10
11student1 = Student("Alice", 101)
12student1.display_info()

Output

Name: Alice, Roll No: 101

What's going on

Student("Alice", 101) calls __init__. self.name sticks on that object, not on the class.

student1.display_info() is display_info(student1) with nicer spelling. Forget self in the method signature and Python yells about missing arguments.

No new keyword. That trips people coming from Java.

NextInstance vs Class Variables