From 898ffd70f6aeeb2363844ec2f39e2961b54fc48a Mon Sep 17 00:00:00 2001 From: Egor Kostan Date: Tue, 9 Sep 2025 18:49:10 -0700 Subject: [PATCH] Update isbn_verifier.py --- isbn-verifier/isbn_verifier.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/isbn-verifier/isbn_verifier.py b/isbn-verifier/isbn_verifier.py index bb5d660..80e1a8a 100644 --- a/isbn-verifier/isbn_verifier.py +++ b/isbn-verifier/isbn_verifier.py @@ -51,7 +51,7 @@ def is_valid(isbn: str) -> bool: if not all(char in ISBN for char in isbn.replace("-", "")) or not isbn: return False # In case X is present, it should be at the end of the string only - if 'X' in isbn and isbn.index('X') != len(isbn) - 1: + if "X" in isbn and isbn.index("X") != len(isbn) - 1: return False # Convert all isbn chars to digits