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Update isbn_verifier.py #112

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Merged
ikostan merged 1 commit into from
Sep 10, 2025
Merged

Update isbn_verifier.py #112

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2 changes: 1 addition & 1 deletion isbn-verifier/isbn_verifier.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down