bpo-37330: open(): "U" mode is removed in Python 3.9 (GH-16972)

Update open() documentation.
(cherry picked from commit 1d2862a323ae1387e306942253b1e487018e2b7f)

Co-authored-by: Victor Stinner <vstinner@python.org>

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 06ba323ca30c6c3ad2fd14eb3e7b5bb37c51fbe8..ff51a4a32cc572b8f65178fb6b118f8800070052 100644 (file)
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1173,7 +1173,7 @@ are always available.  They are listed here in alphabetical order.
 
          * The file is now non-inheritable.
 
-   .. deprecated-removed:: 3.4 4.0
+   .. deprecated-removed:: 3.4 3.9
 
       The ``'U'`` mode.