Updating an abstract medical dating service

In other words, it only allows other classes to inherit from it but cannot be instantiated.

The advantage is that it enforces certain hierarchies for all the subclasses. It is an entity that is defined by the word Interface.

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I will point out main differences, and the rest have already been explained: Abstract classes are useful for modeling a class hierarchy.

At first glance of any requirement, we are partially clear on what exactly is to be built, but we know what to build.

And when you say I am capable of something, you must have that capacity.

Interfaces will mark it as compulsory for a class to implement the same functionalities.

The purpose of an abstract class is to provide a base class definition for how a set of derived classes will work and then allow the programmers to fill the implementation in the derived classes. You can think of an interface as a class which is only allowed to have abstract methods and nothing else.

So an interface can only "declare" and not define the behavior you want the class to have.In simple words, it is a kind of contract that forces all the subclasses to carry on the same hierarchies or standards. An interface has no implementation; it only has the signature or in other words, just the definition of the methods without the body.As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments.In Python, abstract classes are more a programming trick you can get from the ABC module and is actually using metaclasses, and therefore classes.And interfaces are more related to duck typing in this language and it's a mix between conventions and special methods that call descriptors (the __method__ methods).As usual with programming, there is theory, practice, and practice in another language :-) An Interface contains only the definition / signature of functionality, and if we have some common functionality as well as common signatures, then we need to use an abstract class.

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