Python Class

• Why Use Classes?

  • Classes help you:

    • ✅ Organize code
    • ✅ Reuse code
    • ✅ Store related data together
    • ✅ Build large applications easily
       
  • Class will have have two things properties & method

   

• Syntax

class ClassName:
   # Variables
   # Functions (Methods)

• Creating an Object

class Car:
   pass
   
car1 = Car()
print(car1)

Here:

car1 is an object (instance) of the Car class.

• Constructor (__init__)

  • The constructor runs automatically when an object is created.

class Car:
   def __init__(self):
       print("Car Created")
car = Car()

Output

Car Created

• What is self?

  • self refers to the current object.
  • Without self, Python doesn't know which object's data you're referring to.

Example

class Student:
   def __init__(self, name):
       self.name = name
student = Student("Alice")
print(student.name)

Output

Alice

• Methods

  • Functions inside a class are called methods.

class Student:
   def greet(self):
       print("Hello")
student = Student()
student.greet()

Output

Hello

Example: Variables + Methods

class Student:
   def __init__(self, name):
       self.name = name
   def greet(self):
       print("Hello", self.name)
student = Student("Alice")
student.greet()

Output

Hello Alice

Quick Summary