50.1.1. Object Oriented Programming - History
(a) Object-oriented programming was first introduced at MIT in 1950’s.
(b) In 1990, James Gosling of Sun Micro Systems developed a simple version of C++ called Java.
50.1.2. Procedural programming
(a) A programming paradigm informs how problems are analysed and solved in a programming language.
(c) Large systems developed using procedural programming language can be difficult to maintain.
50.1.3. Object based programming
(a) A class is a combination of data and its associated meaningful functions.
(b) Object based programming implements information hiding and abstraction.
50.1.4. Object Oriented Programming - Basics
(a) Objects are instances of classes.
(c) A class is like the blueprint or design of which, instances are made.
(d) A class contains both attributes and methods.
50.1.5. Understanding OOPS Concepts
(a) A class is a combination of data members and member functions.
(b) An object is an instance of a class.
(c) Data in an object represents the attributes or characteristics that define that object.
(d) Methods of an object captures the behaviour of the real world object.
50.1.6. OOPS Concepts
(a) A class is a combination of data and functions, which is nothing but implementation of encapsulation.
(c) An object is a run-time instance of a class.
50.1.7. OOPS - Concepts
(a) Abstraction.
50.1.8. Writing a class in Python
(c) Classes can contain both attributes and methods.
50.1.9. Writing a class in Python
#create an empty class Student
class Student:
pass
#create an object Stud_1 of the class
Stud_1 = Student()
#Take the name as input
Stud_1.name = input("Enter name: ")
#Take the branch as input
Stud_1.branch = input("Enter branch: ")
#Take the rank as input
Stud_1.rank = input("Enter rank: ")
#print the name, age and rank of the object
print("Stud_1.name:", Stud_1.name)
print("Stud_1.branch:", Stud_1.branch)
print("Stud_1.rank:", Stud_1.rank)
50.1.10. Writing a class in Python
#create an empty class Student
class student:
pass
#create an object Stud_1 of the class
Stud_1= student()
#take three inputs name, age, degree and assign the inputs to the stud_1 object
Stud_1.name = input("s1 name: ")
Stud_1.age = input("s1 age: ")
Stud_1.graduate = input("s1 degree: ")
#create an object Stud_2 of the class
Stud_2 = student()
#take three inputs name, age, degree and assign the inputs to the stud_2 onject
Stud_2.name = input("s2 name: ")
Stud_2.age = input("s2 age: ")
Stud_2.graduate = input("s2 degree: ")
#printing the details of the two students
print("Stud_1.name:", Stud_1.name)
print("Stud_1.age:", Stud_1.age)
print("Stud_1.graduate:", Stud_1.graduate)
print("Stud_2.name:", Stud_2.name)
print("Stud_2.age:", Stud_2.age)
print("Stud_2.graduate:", Stud_2.graduate)
50.1.11. Writing a class and creating an instance
class Employee:
pass
#create an instance Emp_1
Emp_1 = Employee()
#take the input name
name = input("name: ")
#assign the input name to Emp_1.name
Emp_1.name = name
#assign 25000 to Emp_1.salary
Emp_1.salary = 25000
#print the name and salary of the employee
print("Emp_1.name:", Emp_1.name)
print("Emp_1.salary:", Emp_1.salary)
50.1.12. Writing a class and creating an instance
#create an empty class Manager
class Manager:
pass
#create an object manager_1 of the class Manager
manager_1 = Manager()
#take three inputs name, department, salary and assign the inputs to manager_1 object
manager_1.name = input("name: ")
manager_1.dept = input("department: ")
manager_1.salary = input("salary: ")
#printing the details of the manager
print("Emp_1.name:", manager_1.name)
print("Emp_1.department:", manager_1.dept)
print("Emp_1.salary:", manager_1.salary)
