[Python-checkins] bpo-13601: Mention stderr's line buffering in What's New (GH-20168)

[Shantanu]

https://github.com/python/cpython/commit/d17f3d8315a3a775ab0807fc80acf92b1bd682f8
commit: d17f3d8315a3a775ab0807fc80acf92b1bd682f8
branch: master
author: Shantanu <hauntsaninja at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2020-05-17T22:07:57-07:00
summary:

bpo-13601: Mention stderr's line buffering in What's New (GH-20168)

files:
M Doc/whatsnew/3.9.rst

diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
index 479c33b4a7fa1..66e7c6461ecd7 100644
--- a/Doc/whatsnew/3.9.rst
+++ b/Doc/whatsnew/3.9.rst
@@ -542,6 +542,10 @@ most platforms.  On Fedora and SuSE, it is equal to ``"lib64"`` on 64-bit
 platforms.
 (Contributed by Jan Matějek, Matěj Cepl, Charalampos Stratakis and Victor Stinner in :issue:`1294959`.)
 
+Previously, :attr:`sys.stderr` was block-buffered when non-interactive. Now
+``stderr`` defaults to always being line-buffered.
+(Contributed by Jendrik Seipp in :issue:`13601`.)
+
 
 typing
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