Python Classes And Objects

Introduction

 

In this article, I will explain Python classes and objects.

 

Definition

 

Python allows object-oriented programming languages. A Class is like a” blueprint" (Class Example: human). An object is like an instance (object Example: man, woman, children). In Python the object is another number is the method.

 

Create a class

 

Class is declared one time. In Python class keyword is used to create a class.

 

Syntax

class New_Class:
      # any code

Example

class add:#class name
  a=10
  b=20
  c=a+b
  print(c)
print(add)#call the class

Output

 

Create a class named add.

 

 

Create object

 

Objects are created many times. We create the class named “new_class” to create objects named “new_object”. In Object last line we must use this symbol ().

 

Syntax

class New_class:
       #any code
object=New_class()

Example

class new_class:#class
  a="c# corner"
  b=20
  c=2.4
new_object=new_class()#object
print(new_object.a)
print(new_object.b)
print(new_object.c)

Output

 

Create a class and object.

 

 

Object method

 

Create a method in the “new_class” class. In Python the object is another number is the method. Objects can also contain methods.

 

Example

class maths:#class name
  def add(self):#function name
    a=10
    b=20
    c=a*b
    print(c)
obj =maths()
obj.add()

Output

 

Create an object method.

 

 

The __init__ () function

 

The __init__ () function is used automatically every time in the class. That means for training we have to understand the built in __init__ () feature. All lessons have a function called __init__ (), which is usually finished while the elegance is being initiated. Use the__init__ () function to assign values to item properties.

 

Example

class computer:#class name

  def __init__(self,computer_name,process,ram,storage):# __init__ ()function
    self.computer_name =computer_name
    self.process =process
    self.ram = ram
    self.storage = storage

obj= computer("hp","i5","4gp","1tb")#object name

print(obj.computer_name)
print(obj.process)
print(obj.ram)
print(obj.storage)

Output

 

Create an __init__ () function.

 

 

The self-parameter

 

The self-parameter refers to the current instance of the class. If you give any parameter you must use a self-keyword.

 

Example

class student:#class
  def __init__(self, name,tamil,english,maths,social,science):# __init__ and self keyword
    self.name = name
    self.tamil = tamil
    self.english = english
    self.maths= maths
    self.social=social
    self.science= science

  def total_mark(self):#self
    print("total mark ",end="")
    print("total mark ",
self.tamil+self.english+self.maths+self.social+self.science)

obj =student("surya", 36,83,45,67,67)#object
obj1 =student("naveen", 36,67,85,57,97)
obj2=student("vijay", 56,83,75,47,87)
obj.total_mark()
obj1.total_mark()
obj2.total_mark()

Output

 

Self-keyword usage.

 

 

Modify object properties

 

Modify objects are used to change object properties.

 

Example

class car:#class
  def __init__(self, car_name, mil):
    self.car_name = car_name
    self.mil = mil
  def myfunc(self):
    print(self.car_name,self.mil)

car1= car("Lamborghini", 20)#object
car2= car("ford",30)
car3= car("bmw", 40)

car2.mil=28#modify object

car1.myfunc()
car2.myfunc()
car3.myfunc()

Output

 

Modify object.

 

 

Conclusion

 

In this article, we have seen Python classes and objects. I hope this article was useful to you. Thanks for reading!