Documentation.

Author: serhiy-storchaka

Doc/library/os.path.rst

@@ -411,6 +411,8 @@ the :mod:`glob` module.)
    If a path doesn't exist or a symlink loop is encountered, and *strict* is
    ``True``, :exc:`OSError` is raised. If *strict* is ``False`` these errors
    are ignored, and so the result might be missing or otherwise inaccessible.
+   If *strict* is :data:`ALL_BUT_LAST`, the last component of the path
+   might be missing, but other errors are not ignored.
 
    .. note::
       This function emulates the operating system's procedure for making a path
@@ -429,6 +431,16 @@ the :mod:`glob` module.)
    .. versionchanged:: 3.10
       The *strict* parameter was added.
 
+   .. versionchanged:: next
+      Support for :data:`ALL_BUT_LAST` was added.
+
+
+.. data:: ALL_BUT_LAST
+
+   Special value used for *strict* in :func:`realpath`.
+
+   .. versionadded:: next
+
 
 .. function:: relpath(path, start=os.curdir)
 

Doc/whatsnew/3.15.rst

@@ -89,6 +89,12 @@ New modules
 Improved modules
 ================
 
+os.path
+-------
+
+* Add support of the all-but-last mode in :func:`~os.path.realpath`.
+  (Contributed by Serhiy Storchaka in :gh:`71189`.)
+
 ssl
 ---
 

Misc/NEWS.d/next/Library/2025-05-20-11-51-17.gh-issue-71189.0LpTB1.rst

@@ -0,0 +1 @@
+Add support of the all-but-last mode in :func:`os.path.realpath`.