From d7ab96856c415ba6a64f27fbbf93c0458779cf97 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 15 May 2021 09:42:52 +0530
Subject: [PATCH] ...

---
 kitty/rc/set_background_image.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kitty/rc/set_background_image.py b/kitty/rc/set_background_image.py
index 953308d46..54fdf4d60 100644
--- a/kitty/rc/set_background_image.py
+++ b/kitty/rc/set_background_image.py
@@ -82,7 +82,7 @@ failed, the command will exit with a success code.
             ret['data'] = '-'
             return ret
         if imghdr.what(path) != 'png':
-            self.fatal('{} is not a PNG image'.format(path))
+            self.fatal(f'{path} is not a PNG image')
 
         def file_pipe(path: str) -> Generator[Dict, None, None]:
             with open(path, 'rb') as f: