From 5e1090641d179c2bdee5a8b58c9a6e2cf53b5e3a Mon Sep 17 00:00:00 2001
From: Yoann Schneider <yschneider@teklia.com>
Date: Fri, 15 Sep 2023 12:15:29 +0000
Subject: [PATCH] Error in _valid_image_format

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

diff --git a/dan/datasets/extract/__init__.py b/dan/datasets/extract/__init__.py
index 880c0022..d04412f8 100644
--- a/dan/datasets/extract/__init__.py
+++ b/dan/datasets/extract/__init__.py
@@ -39,7 +39,7 @@ def validate_char(char):
 def _valid_image_format(value: str):
     im_format = value
     if not im_format.startswith("."):
-        im_format.insert(0, ".")
+        im_format = "." + im_format
     return im_format
 
 
-- 
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