Document that the built-in open() when called with a file descriptor ignores "mode" argument

At https://docs.python.org/3/library/functions.html#open, in the documentation of the mode argument there is no information that this argument is ignored when the function is called with a file descriptor instead of a path.

See Why does os.fdopen ignore mode? SO question. The question talks about os.fdopen() but according to https://docs.python.org/3/library/os.html#os.fdopen

This is an alias of the open() built-in function and accepts the same arguments.

so I think it should be enough to place the information in the documentation of the mode argument of the built-in open() function. This way it would document the built-in open() function but also the os.fdopen() function by virtue of the latter being an alias of the former.

Inizia dalla documentazione collegata della funzione incorporata open() ed esamina la descrizione dell’argomento mode. Controlla la voce collegata os.fdopen() per confermare il contesto dell’alias, quindi documenta che mode viene ignorato quando open() riceve un descrittore di file; la documentazione di open() e os.fdopen() dovrebbe comunicare chiaramente questo comportamento.