example

class Person:
    def __init__ (self, name = 'Kiran', age = 23, city = 'california'):
        self.name = name
        self.age = age
        self.city = city
        
    def olive(self):
        return f'{self.name} is {self.age} years old. He lives in {self.city}.'
        
p = Person()
print(p.olive())