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!