Hi,

I think the note in the docu could be improved:

"""To read a ``file object'' returned by the built-in
function open() or by popen() or fdopen(), or
sys.stdin, use its read() or readline() methods."""

(I think) a better note:

"""To read a ``file object'' returned by the built-in
function open(), popen(), fdopen() or sys.stdin, use
its read() or readline() methods. You can convert the
file descriptor returned by os.open() to a file object
with [LINK os.fdopen()]"""

The same note is used for os.write().

At os.open() there should be a link to os.fdopen(), too.