Abstract class

They make sure that derived classes implement methods and properties dictated in the abstract base class. Abstract base classes separate the interface from the implementation. They define generic methods and properties that must be used in subclasses.

Implementation is handled by the concrete subclasses where we can create objects that can handle tasks. They help to avoid bugs and make the class hierarchies easier to maintain by providing a strict recipe to follow for creating subclasses.

An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and its abstract methods must be implemented by its subclasses.

class Storage:
    def add(self, item: dict):
        raise NotImplementedError

    def get(self, pk: int):
        raise NotImplementedError

from abc import ABC, abstractmethod

class AbstractClassName(ABC):
    @abstractmethod
    def abstract_method_name(self):
        pass