From ff3c9739bd69aa8b58007e63c9e40e6708b4761e Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Wed, 31 Mar 2021 14:26:08 +0900
Subject: bpo-43510: PEP 597: Accept `encoding="locale"` in binary mode
 (GH-25103)

It make `encoding="locale"` usable everywhere `encoding=None` is
allowed.
---
 Modules/_io/_iomodule.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Modules')

diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 652c2ce5b0..c627ca257f 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -346,7 +346,8 @@ _io_open_impl(PyObject *module, PyObject *file, const char *mode,
         goto error;
     }
 
-    if (binary && encoding != NULL) {
+    if (binary && encoding != NULL
+            && strcmp(encoding, "locale") != 0) {
         PyErr_SetString(PyExc_ValueError,
                         "binary mode doesn't take an encoding argument");
         goto error;
-- 
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