From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Fri, 22 May 2020 22:22:51 +0000 (-0700)
Subject: bpo-40327: Improve atomicity, speed, and memory efficiency of the items() loop (GH... 
X-Git-Tag: v3.8.4rc1~102
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=16d07812dd3833295cc001d19eea42eecbdb6ea5;p=thirdparty%2FPython%2Fcpython.git

bpo-40327: Improve atomicity, speed, and memory efficiency of the items() loop (GH-19628)

(cherry picked from commit 75bedbe2ed4119ff18a2ea86c544b3cf08a92e75)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
---

diff --git a/Lib/pickle.py b/Lib/pickle.py
index 515cb8a0bb3f..af50a9b0c06b 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -339,7 +339,7 @@ def whichmodule(obj, name):
         return module_name
     # Protect the iteration by using a list copy of sys.modules against dynamic
     # modules that trigger imports of other modules upon calls to getattr.
-    for module_name, module in list(sys.modules.items()):
+    for module_name, module in sys.modules.copy().items():
         if module_name == '__main__' or module is None:
             continue
         try: