Refactor Code using Black Formatter

Author: Zingzy

pdfly/cat.py

@@ -37,6 +37,7 @@
         In case you don't want chapter 10 before chapter 2.
 
 """
+
 # Copyright (c) 2014, Steve Witham <switham_github@mac-guyver.com>.
 # All rights reserved. This software is available under a BSD license;
 # see https://github.com/py-pdf/pypdf/LICENSE
@@ -75,8 +76,17 @@ def main(
             reader = PdfReader(in_fs[filename])
             num_pages = len(reader.pages)
             start, end, step = page_range.indices(num_pages)
-            if start < 0 or end < 0 or start >= num_pages or end > num_pages or start > end:
-                print(f"WARNING: Page range {page_range} is out of bounds", file=sys.stderr)
+            if (
+                start < 0
+                or end < 0
+                or start >= num_pages
+                or end > num_pages
+                or start > end
+            ):
+                print(
+                    f"WARNING: Page range {page_range} is out of bounds",
+                    file=sys.stderr,
+                )
             for page_num in range(*page_range.indices(len(reader.pages))):
                 writer.add_page(reader.pages[page_num])
         writer.write(output_fh)