From df59273c7a384ea8c890fa8e9b80c92825df841c Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Thu, 29 Oct 2020 03:44:35 -0600
Subject: bpo-34204: Use pickle.DEFAULT_PROTOCOL in shelve (GH-19639)

Use pickle.DEFAULT_PROTOCOL (currently 5) in shelve instead of a
hardcoded 3.
---
 Lib/shelve.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'Lib/shelve.py')

diff --git a/Lib/shelve.py b/Lib/shelve.py
index 5d443a0fa8..e053c39734 100644
--- a/Lib/shelve.py
+++ b/Lib/shelve.py
@@ -56,7 +56,7 @@ entries in the cache, and empty the cache (d.sync() also synchronizes
 the persistent dictionary on disk, if feasible).
 """
 
-from pickle import Pickler, Unpickler
+from pickle import DEFAULT_PROTOCOL, Pickler, Unpickler
 from io import BytesIO
 
 import collections.abc
@@ -85,7 +85,7 @@ class Shelf(collections.abc.MutableMapping):
                  keyencoding="utf-8"):
         self.dict = dict
         if protocol is None:
-            protocol = 3
+            protocol = DEFAULT_PROTOCOL
         self._protocol = protocol
         self.writeback = writeback
         self.cache = {}
-- 
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