Apply ruff/refurb rule (FURB142)

FURB142 Use of `set.add()` in a for loop

Author: DimitriPapadopoulos

distutils/dir_util.py

@@ -95,8 +95,7 @@ def create_tree(base_dir, files, mode=0o777, verbose=1, dry_run=0):
     """
     # First get the list of directories to create
     need_dir = set()
-    for file in files:
-        need_dir.add(os.path.join(base_dir, os.path.dirname(file)))
+    need_dir.update(os.path.join(base_dir, os.path.dirname(file)) for file in files)
 
     # Now create them
     for dir in sorted(need_dir):