OOPs Concepts
* Class
* Objects
* Inheritance
* Polymorphism
* Abstraction
* Encapsulation
(toc) #title=(Types of OOP's)
What is class?
* Python classes provide all the standard features of Object-Oriented Programming: the class inheritance mechanism allows multiple base classes, a derived class can override any methods of its base class or classes, and a method can call the method of a base class with same name.
* How to create class in python
class classname:
class body
What are Objects?
* Class objects support two kinds of operations: attribute references and instantiation.
* Attribute references use the standard syntax used for all attribute references in Python: obj.name
What is Constructor?
* Constructor means it's a special member function which calls whenever object create of that class.
* Constructor is identified by (_) underscore.
* __init__ function: This function is called constructor in python and is call whenever the object is created of that class.
* How to create constructor in python
def __init__(self):
Constructor body
Program 1) #create class
class myclass:
x=5
print(myclass)
Output = <class '__main__.myclass'>
Program 2) # Create Object
class myclass:
a=5
b= myclass()
print(b.a)
Output = 5
Program 3) #Calling a function by object
class myclass:
def myfunction (self): #property of myclass
print('"Hello Word")
a = myclass() #creating an object
a.myfunction()
Output= Hello Word
Program 4) #How create constructor
class myclass:
def __init__(self): #creating a constructor
print("This is my constructor")
a = myclass() #creating an object
Output = This is my constructor
Program 5) #change the value by object
class myclass:
def __init__(self,name,age):
self.name = name
self.age = age
def myfunction(self):
print("My name is: "+self.name)
a = myclass("Ram", 20) #creating an object
a.name
a.age
Output = Ram,20
Program 6) #How create constructor
class myclass:
def __init__(self): #creating a constructor
print("This is my constructor")
a = myclass() #creating an object
Output = This is my constructor
Program 7) #change the value by object
class myclass:
def __init__(self,name,age):
self.name = name
self.age = age
def myfunction(self):
print("My name is: "+self.name)
a = myclass("Ram", 20) #creating an object
a.age =25
a.name
print("Age: ", a1.age)
Output = Age: 25
