[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

barcode/isxn.py

@@ -72,7 +72,6 @@ def __init__(self, isbn, writer=None):
         super().__init__("978" + isbn, writer)
         self.isbn10 = isbn
         self.isbn10 = f"{isbn}{self._calculate_checksum()}"
-        
 
     def _calculate_checksum(self):
         tmp = sum(x * int(y) for x, y in enumerate(self.isbn10[:9], start=1)) % 11