From: Pieter Eendebak <pieter.eendebak@gmail.com>
Date: Fri, 29 Sep 2023 07:28:01 +0000 (+0200)
Subject: gh-109868: Skip deepcopy memo check for empty memo (GH-109869)
X-Git-Tag: v3.13.0a1~237
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05079d93e410fca1e41ed32e67c54d63cbd9b35b;p=thirdparty%2FPython%2Fcpython.git

gh-109868: Skip deepcopy memo check for empty memo (GH-109869)
---

diff --git a/Lib/copy.py b/Lib/copy.py
index 6d7bb9a111b5..a69bc4e78c20 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -121,13 +121,13 @@ def deepcopy(x, memo=None, _nil=[]):
     See the module's __doc__ string for more info.
     """
 
+    d = id(x)
     if memo is None:
         memo = {}
-
-    d = id(x)
-    y = memo.get(d, _nil)
-    if y is not _nil:
-        return y
+    else:
+        y = memo.get(d, _nil)
+        if y is not _nil:
+            return y
 
     cls = type(x)