Discussion of sys module in Data Model

Documentation

In the section titled "I/O objects (also known as file objects)" in the Data Model chapter, it says:

The objects sys.stdin, sys.stdout and sys.stderr are initialized to file objects corresponding to the interpreter’s standard input, output and error streams; they are all open in text mode and therefore follow the interface defined by the io.TextIOBase abstract class.

However, neither the sys nor the io modules have been introduced (and probably should not be in this chapter). Is it appropriate to talk about module-specific features here? Or maybe this text should be modified to lean towards those objects just as examples of file objects?

Inizia dalla sezione “I/O objects (also known as file objects)” del capitolo Data Model e leggi la discussione circostante per valutare se i riferimenti a sys e io siano introdotti in modo appropriato. Il lavoro è concluso quando si è stabilito se mantenere questi esempi specifici dei moduli o rivedere il passaggio per presentarli soltanto come esempi di file objects.