# HG changeset patch
# User Manuel Jacob <m...@manueljacob.de>
# Date 1591334452 -7200
# Fri Jun 05 07:20:52 2020 +0200
# Branch stable
# Node ID ab1bb054809d078f7111c5145c1a4e2c536d37c5
# Parent 2dc5ae953c4a8265578acbe7d3e26c93ec8a08fb
# EXP-Topic streams
py3: add warning about buffering behavior of pycompat.{stdout,stderr}
diff --git a/mercurial/pycompat.py b/mercurial/pycompat.py
--- a/mercurial/pycompat.py
+++ b/mercurial/pycompat.py
@@ -143,6 +143,11 @@ if ispy3:
long = int
+ # Warning: sys.stdout.buffer and sys.stderr.buffer do not necessarily have
+ # the same buffering behavior as sys.stdout and sys.stderr. The interpreter
+ # initializes them with block-buffered streams or unbuffered streams (when
+ # the -u option or the PYTHONUNBUFFERED environment variable is set), never
+ # with a line-buffered stream.
# TODO: .buffer might not exist if std streams were replaced; we'll need
# a silly wrapper to make a bytes stream backed by a unicode one.
stdin = sys.stdin.buffer
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