Use os.walk for old Pythons

docs/sphinx-docs/collect_sphinx_sources.py

@@ -2,6 +2,7 @@
 """
 Script to collect sphinx sources for building
 """
+import os
 from pathlib import Path
 import shutil
 from distutils.dir_util import copy_tree
@@ -106,9 +107,10 @@ def retrieve_user_docs():
     print("=== Retrieve User Docs ===")
 
     # Copy documentation files from sas/.../media to the sphinx directory
-    for root, dirs, _ in SASVIEW_MEDIA_SOURCE.walk():
+    for root, dirs, _ in os.walk(SASVIEW_MEDIA_SOURCE):
+        # CRUFT: from 3.12, use SASVIEW_MEDIA_SOURCE.walk()
         if 'media' in dirs:
-            source_dir = (root / "media").resolve()
+            source_dir = (Path(root) / "media").resolve()
             relative = source_dir.relative_to(SASVIEW_MEDIA_SOURCE).parent
             dest_dir = SPHINX_SOURCE / "user" / relative