Working with Python – Class and Object Concept

Introduction

Python is an Object oriented Language. An object contains Propertied and Method and the Class is the blueprint of creating Object. In this Blog post, we are going to discuss about Class and Objects of Python.



How to Create a Class

To create a class we must use the keyword Class.

Example:

class ExampleClass:
      x = 5


In this example we are just create a class named ExampleClass.

 

How to Create an Object

After creating class, we have to create the Object.

class ExampleClass:
      x = 5


a = ExampleClass()
print(a.x)

 

In the above example, the class is as a simplest form. To understand the class, we have to understand the __Init__() function

 

 

Understanding the __init__() Function

Hope, we all have the knowledge of constructor in C++ Language. __init__() function do the same thing as Constructer does. This function is called automatically when the Object is created. Let us take a simple example to understand that.

Example:

class ExampleClass:
  def __init__(self, name, age):
      self.name = name
      self.age = age

a = ExampleClass("Mayuree", 22)

print(a.name)
print(a.age)

 

Mayuree
22

 

 

Method in the Class

Previously, we checked the Property of the class and now we need a method in our class.

Example:

class ExampleClass:
  def __init__(self, name, age):
      self.name = name
      self.age = age

  def myfunc(self):
      print("Hello my name is " + self.name)



a = ExampleClass("Mayuree", 22)
a.myfunc()


Hello my name is Mayuree

 

Self Parameters

In the previous example of __init__() constructor, we used self as a parameters. Question is in mind that what is self parameters. The self parameter is a reference to the current instance of the class, and is used to access variables that belongs to the class. It does not have to be named self, we can call it whatever you like, but it has to be the first parameter of any function in the class

 

Delete Object Property

In the above example we have two propertied in the Class object named “a”. One is “name” and other is “age”. Now we need to delete the age property.

del a.age

 

 

Delete Object

If we need to delete an object.

del a

 



 

Hope you like it.


Comments

  1. SQL Knowledge Bank - Azure25 June 2020 at 21:39

    I have no idea why __init__ is not printed as i tried several time by typing it.

    ReplyDelete
  2. Shradha26 June 2020 at 18:52

    Here we are calling the function also in init like a.name and a.age ,isn't it?

    ReplyDelete
    Replies
    1. SQL Knowledge Bank - Azure28 June 2020 at 19:55

      U can say that. But the Best answer is, Constructor Construct automatically when the object is created.

      Delete

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