Methods

Because you already know about functions, you also know about methods in classes. Methods are just function objects created by def statements nested in a class statement’s body. From an abstract perspective, methods provide behavior for instance objects to inherit. From a programming perspective, methods work in exactly the same way as simple functions, with one crucial exception: a method’s first argument always receives the instance object that is the implied subject of the method call.

In other words, Python automatically maps instance method calls to class method functions as follows. Method calls made through an instance, like this:

instance.method(args...)