Abstraction in python is the concept of object oriented programming, where user is unaware the complex implementation detail of functionality and internal working, whereas user is only able to see the basic functionalities and internal details are hidden.

A python identifier is a name for variable, function, class or module. when we create something while coding we have to name it to differentiate from other code entities, so python provides us a set of rules for naming these coding entities, These rules also known as identifiers rules.