Different programming languages define “object” in different ways. In some, it means that all objects must have attributes and methods; in others, it means that all objects are subclassable. In Python, the definition is looser; some objects have neither attributes nor methods (more on this in Chapter 3), and not all objects are subclassable (more on this in Chapter 5).
I am coming from C++/Java background.
To be subclassable means that you can inherit from them. e.g.
objecthere is subclassable because Foo can inherit from it.