Refs #23919 -- Removed django.utils._os.upath()/npath()/abspathu() usage.

These functions do nothing on Python 3.

django/utils/_os.py

@@ -5,20 +5,19 @@ from os.path import abspath, dirname, join, normcase, sep
 from django.core.exceptions import SuspiciousFileOperation
 from django.utils.encoding import force_text
 
+# For backwards-compatibility in Django 2.0
 abspathu = abspath
 
 
 def upath(path):
-    """
-    Always return a unicode path.
-    """
+    """Always return a unicode path (did something for Python 2)."""
     return path
 
 
 def npath(path):
     """
     Always return a native path, that is unicode on Python 3 and bytestring on
-    Python 2.
+    Python 2. Noop for Python 3.
     """
     return path
 
@@ -33,8 +32,8 @@ def safe_join(base, *paths):
     """
     base = force_text(base)
     paths = [force_text(p) for p in paths]
-    final_path = abspathu(join(base, *paths))
-    base_path = abspathu(base)
+    final_path = abspath(join(base, *paths))
+    base_path = abspath(base)
     # Ensure final_path starts with base_path (using normcase to ensure we
     # don't false-negative on case insensitive operating systems like Windows),
     # further, one of the following conditions must be true: