[3.12] gh-105857: Document that asyncio subprocess std{in,out,err} can be file handle...

(cherry picked from commit 13966da71b693b1fae1a8ef66e34e2f0a90ec6c0)

Co-authored-by: Hadházy Tamás <85063808+Hels15@users.noreply.github.com>

diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 8f2d8f336c82bb2e92b1cae759aa7e8c6e5df9b5..04af53b980ff9eb90adeb4782d390c869fe9aa9a 100644 (file)
--- 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