From 255b7a8be0846a46ef850f3965e07a17b1205dec Mon Sep 17 00:00:00 2001
From: Ron Shapiro <ronshapiro@verily.com>
Date: Mon, 7 Nov 2022 15:27:29 +0200
Subject: [PATCH] Fix immutabledict.__ior__ error

---
 immutabledict/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/immutabledict/__init__.py b/immutabledict/__init__.py
index 18790bb..faf285d 100644
--- a/immutabledict/__init__.py
+++ b/immutabledict/__init__.py
@@ -67,7 +67,7 @@ def __ror__(self, other: Any) -> Dict[Any, Any]:
         return new
 
     def __ior__(self, other: Any) -> "immutabledict[_K, _V]":
-        raise TypeError("'%s' object is not mutable", self.__class__.__name__)
+        raise TypeError(f"'{self.__class__.__name__}' object is not mutable")
 
 
 class ImmutableOrderedDict(immutabledict):