Object Oriented Programming In Python-

• • Python is a fully object oriented programming language because it doesn’t support static data type concept where you need to declare the the data type at the time of variable creation.
  • 1) Encapsulation
  • 2) Inheritance
  • 3) Abstraction(Python doesn’t support this but somehow we can do it)
  • 4) Polymorphism

 

• 1) Encapsulation-

• – Protecting the object info from outside access.
• – To implement encapsulation, we have to follow below-
• 1) Class should be public
• 2) Variables should be private
• 3) We can access the info only via methods like setter() and getter()

Ex-

class Student:
    def __init__(self, rollno, name):
        self.__name = name
        self.__rollno = rollno

    def getName(self):
        return self.__name

    def getrollno(self):
        return self.__rollno

    def setrollno(self, rollno):
        self.__rollno = rollno
        print("Rollno was set")

    def setName(self, name):
        self.__name = name
        print("Name was set")

    def main():
        obj = Student(101, 'Rohit')
        obj.getName()
        rollno = obj.getrollno()
        print("RollNo before set-", rollno)
        obj.setrollno(102)
        rollno = obj.getrollno()
        print("RollNo after set-", rollno)
        print(id(obj.getrollno))

Student.main()
Output-
	RollNo before set- 101
	Rollno was set
	RollNo after set- 102
	2361410337992