Update pydantic_extra_types/isbn.py

pydantic · Jan 2, 2024 · 2bac2dc · 2bac2dc
1 parent d0c48d9
commit 2bac2dc
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pydantic_extra_types/isbn.py b/pydantic_extra_types/isbn.py
@@ -124,7 +124,7 @@ def convert_isbn10_to_isbn13(value: str) -> str:
         """
 
         if len(value) == 10:
-            base_isbn = '978' + value[:-1]
+            base_isbn = f'978{value[:-1]}'
             isbn13_digit = isbn13_digit_calc(base_isbn)
             return ISBN(f'{base_isbn}{isbn13_digit}')