self

This represents the instance of the class
This is not a keyword.

class Student: 
    def __init__(self, name, age): 
        # 'self' refers to the specific object being created  
        self.name = name 
        self.age = age 

    def introduce(self): 
        # Methods use 'self' to access the object's data 
        return f"My name is {self.name} and I am {self.age} years old." 

    def birthday(self): 
        # 'self' lets the method modify the object's state 
        self.age += 1 
        return f"Happy birthday, {self.name}! You are now {self.age}." 

# Using the class 
s1 = Student("Alice", 20) 
print(s1.introduce()) 

print(s1.birthday()) 
print(s1.introduce())