[Python-checkins] bpo-23493: json: Change sort_keys in Python encoder same to C (GH-8131)

[INADA Naoki]

https://github.com/python/cpython/commit/e25399b40cd15620e77c9ad2ed24549006ae9b47
commit: e25399b40cd15620e77c9ad2ed24549006ae9b47
branch: master
author: INADA Naoki <methane at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2018-07-07T08:55:03+09:00
summary:

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.

files:
M Lib/json/encoder.py

diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index fb083ed61bb1..2d7b8989c711 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -350,7 +350,7 @@ def _iterencode_dict(dct, _current_indent_level):
             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: