From e25399b40cd15620e77c9ad2ed24549006ae9b47 Mon Sep 17 00:00:00 2001
From: INADA Naoki <methane@users.noreply.github.com>
Date: Sat, 7 Jul 2018 08:55:03 +0900
Subject: [PATCH] bpo-23493: json: Change sort_keys in Python encoder same to C
 (GH-8131)

Stop using key=lambda.  This behavior is same to C version encoder.
---
 Lib/json/encoder.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index fb083ed61bb..2d7b8989c71 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -350,7 +350,7 @@ def _make_iterencode(markers, _default, _encoder, _indent, _floatstr,
             item_separator = _item_separator
         first = True
         if _sort_keys:
-            items = sorted(dct.items(), key=lambda kv: kv[0])
+            items = sorted(dct.items())
         else:
             items = dct.items()
         for key, value in items: