ISBN: Fixed mypy format logic issues

pydantic · Dec 29, 2023 · 4f295bf · 4f295bf
1 parent 018d1e1
commit 4f295bf
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/pydantic_extra_types/isbn.py b/pydantic_extra_types/isbn.py
@@ -107,6 +107,9 @@ def validate_isbn_digits(value: str) -> None:
         validation_functions = {10: isbn10_digit_calc, 13: isbn13_digit_calc}
         validate = validation_functions.get(isbn_length)
 
+        if not callable(validate):
+            raise PydanticCustomError('isbn_invalid_length', f'Unsupported ISBN length: {isbn_length}')
+
         if validate(value) != value[-1]:
             raise PydanticCustomError('isbn_invalid_digit_check_isbn', 'Provided digit is invalid for given ISBN')