NEXT TUTORIAL >> Instance variable & Instance method

Inner Class or Nested Class comes into existence when we define a class inside another class.

Consider two classes, A and B, and assume that class B is defined within class A, in such cases, class B is known as Nested Class or Inner Class.

class A:
  class B:

In the above code, class B is the inner class or nested class defined under class A.

Let’s see one example of Nested class :

We are defining two classes, namely Employee and Skill.

Idea is to make Skill class as an inner class and Employee as an outer class.

class Employee: # outer class
  def __init__(self, name, mail): 
    self.name = name
    self.mail = mail
  def display(self):
    print('Employee name : ', self.name)
    print('Employee mail : ', self.mail)    

  class Skill: # inner class
    def __init__(self, skill):
      self.skill = skill
    def display(self):
      print('Employee skill : ', self.skill) 
  
emp = Employee('Shrey','[email protected]')
emp.display()
skill = emp.Skill('MERN| Py-Dj| RWD') # Instantiating inner class with instance of outer class
skill.display()

O/P

Employee name : Shrey
Employee mail : [email protected]
Employee skill : MERN| Py-Dj| RWD

That’s all here.

NEXT TUTORIAL >> Instance variable & Instance method