From df91f232d7208cbee8a21329410ec5d29a2e44a5 Mon Sep 17 00:00:00 2001
From: Yoav Kleinberger <haarcuba@gmail.com>
Date: Wed, 19 Mar 2025 12:31:58 +0200
Subject: [PATCH] fix mistake

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index b41b8af..361480a 100644
--- a/README.md
+++ b/README.md
@@ -1085,6 +1085,7 @@ The proper way to have mutable default values is:
 #good:)
 def add_to(element, to=None):
     if to is None:
+        to = {}
         to['a'] = element
         return to
 ```