Introduction to OOP's Class Object Constructor Instance Variables Class Variables Instance Methods self Keyword Encapsulation Public Members Protected Members Private Members Inheritance Single Inheritance Multiple Inheritance Multilevel Inheritance Hierarchical Inheritance Hybrid Inheritance super() Function Polymorphism Method Overriding Duck Typing Abstraction Abstract Class Abstract Method Class Method Static Method Special Methods _str_ Method Operator Overloading Composition Aggregation Association Method Resolution Order Object Class issubclass() and isinstance() Property Decorator Setter Method with @property Destructor Inner Class Complete Mini Example

class B:
    def __init__(self, obj):
        self.obj = obj

class Department:
    def __init__(self, name):
        self.name = name

class Teacher:
    def __init__(self, name, department):
        self.name = name
        self.department = department

d = Department("Computer Science")
t = Teacher("Ravi", d)
print(t.name)
print(t.department.name)

Ravi
Computer Science