dunder method in python

 Dunder method and abstract method:- 

class Person:

    no_name= "Test one"

    def __init__(self,name,age,salary):

        self.name = name

        self.age = age

        self.salary = salary

    def printDetails(self):

        return f"Name is {self.name} and age is {self.age} and the salary of the user is {self.salary}"

    # jo __add __ wale jo function hote hai usko hi dunder method kahte hai

    # def __add__(self,other):

    #     return self.salary + other.salary

   

    # object ko summary kare ke liye use karte hai    

    def __repr__(self):

        return self.printDetails()

    def __str__(self):

        return self.printDetails()

   

    # equal methd in the dunder method

    def __eq__(self, b):

        if self.name == b.name:

            return "equal hai bhai"

        else:

            return "Not equal hai bhai"

       

    def __lt__(self,other):

        if self.salary > other.salary:

            return "Greater"

        else:

            return "Smaller"

       

    def __mul__(self,other):

        return self.age * other.age

    def __sub__(self,other):

        return self.age - other.age

    def is_(a,b):

        return f"true" if a==b else "false"

vishal = Person("vishal",2,66666)

lakhan = Person("Rohan",2,34)

print(vishal == lakhan)