PYTHON - OBJECT ORIENTED PROGRAMMING .pptx

PYTHON - OBJECT ORIENTED PROGRAMMING .pptx

• 1.
  Object oriented programming •5 things in oops concept 1. Polymorphism 2. Encapsulation 3. Inheritance 4. Abstraction 5. Classes & Objects
• 2.
  Class • Python isan Object Oriented Programming language. • Almost everything in Python is an Object , with its properties and methods. • Class is a set of variables and functions. • class keyword is used to create Class.
• 3.
  Some Points tocreate python class • Classes are created by keyword class. • Attributes are the variables that belong to a class. • Attributes are always public and can be accessed using dot(.) operator. • Eg: Myclass.MyAttribute
• 4.
  Create a class •To create a class , use the keyword class: Syntax : class definition class ClassName: #statement Example, class MyClass: x=5 print(MyClass)
• 5.
  Create an Object •An Object is an instance of a Class. Syntax : Object definition Obj=ClassName() Print(obj.atrr)
• 6.
  • Example, class MyClass: x=5 p1= MyClass() print(p1.x) Output: 5
• 7.
  The __init__() Function •All classes have a function called __init__(),which is always executed when the class is being initiated. • Use the __init__() function to assign values to object properties.
• 8.
  • Example, class Person: def__init__(self , name , age): self.name=name self.age=age p1 = person(“Lizi”,21) print(p1.name) print(p1.age) Output: Lizi 21
• 9.
  The __str__() Function •The __str__() function controls what should be returned when the class object is represented as a string
• 10.
  Example, class Person: def __init__(self, name , age): self.name=name self.age=age p1 = person(“Lizi”,21) Output: <__main__.Person object at 0x15039e602100>
• 11.
  The self parameter •The self parameter is a reference to the current instance of the class , and is used to access variables that belongs to the class.
• 12.
  Real time example Oottyclass Person 1 Person 2 Object Education Party
• 13.
  • Example, class ooty: defeducation(self): print(“research for flowers”) def boathouse(self): print(“Let’s Party”) Person 1=ooty() Person 2=ooty() Person 1.education() Person 2.boathouse()
• 14.
  • Output: research forflowers Let’s Party