message_about_scripts_not_on_PATH: use pathlib also for parent_dir an…

…d script_name directly

src/pip/_internal/operations/install/wheel.py

@@ -136,10 +136,10 @@ def message_about_scripts_not_on_PATH(scripts: Sequence[str]) -> Optional[str]:
         return None
 
     # Group scripts by the path they were installed in
-    grouped_by_dir: Dict[str, Set[str]] = collections.defaultdict(set)
+    grouped_by_dir: Dict[Path, Set[str]] = collections.defaultdict(set)
     for destfile in scripts:
-        parent_dir = os.path.dirname(destfile)
-        script_name = os.path.basename(destfile)
+        parent_dir = Path(destfile).parent.resolve()
+        script_name = Path(destfile).name
         grouped_by_dir[parent_dir].add(script_name)
 
     # We don't want to warn for directories that are on PATH.
@@ -149,10 +149,10 @@ def message_about_scripts_not_on_PATH(scripts: Sequence[str]) -> Optional[str]:
     # If an executable sits with sys.executable, we don't warn for it.
     #     This covers the case of venv invocations without activating the venv.
     not_warn_dirs.append(Path(sys.executable).parent.resolve())
-    warn_for: Dict[str, Set[str]] = {
+    warn_for: Dict[Path, Set[str]] = {
         parent_dir: scripts
         for parent_dir, scripts in grouped_by_dir.items()
-        if Path(parent_dir).resolve() not in not_warn_dirs
+        if parent_dir not in not_warn_dirs
     }
     if not warn_for:
         return None