[Python-checkins] gh-105857: Document that asyncio subprocess std{in, out, err} can be file handles (#107986)

[ambv]

https://github.com/python/cpython/commit/13966da71b693b1fae1a8ef66e34e2f0a90ec6c0
commit: 13966da71b693b1fae1a8ef66e34e2f0a90ec6c0
branch: main
author: Hadházy Tamás <85063808+Hels15 at users.noreply.github.com>
committer: ambv <lukasz at langa.pl>
date: 2023-08-22T20:41:56+02:00
summary:

gh-105857: Document that asyncio subprocess std{in,out,err} can be file handles (#107986)

stdin/out can be filehandles -> add to docs.

files:
M Doc/library/asyncio-eventloop.rst

diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 8f2d8f336c82b..04af53b980ff9 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -1442,6 +1442,7 @@ async/await code consider using the high-level
    * *stdin* can be any of these:
 
      * a file-like object
+     * an existing file descriptor (a positive integer), for example those created with :meth:`os.pipe()`
      * the :const:`subprocess.PIPE` constant (default) which will create a new
        pipe and connect it,
      * the value ``None`` which will make the subprocess inherit the file