gh-77607: Improve accuracy of os.path.join docs (#101406)

hauntsaninja · web-flow · commit 909a6746939e · 2023-01-30T21:39:30.000-08:00
This is a follow-up to #100811. One of the changes in that PR isn't accurate in that `os.path.join('', '')` will not end in a separator. This reverts that change to the previous wording that used "only", but explicitly calls out the case where the last part ends in a separator, which is what caused confusin in #77607 and motivated the change in #100811.
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
@@ -308,11 +308,11 @@ the :mod:`glob` module.)
 
    Join one or more path segments intelligently.  The return value is the
    concatenation of *path* and all members of *\*paths*, with exactly one
-   directory separator following each non-empty part except the last. That is,
-   if the last part is empty, the result will end in a separator. If
-   a segment is an absolute path (which on Windows requires both a drive and a
-   root), then all previous segments are ignored and joining continues from the
-   absolute path segment.
+   directory separator following each non-empty part, except the last. That is,
+   the result will only end in a separator if the last part is either empty or
+   ends in a separator. If a segment is an absolute path (which on Windows
+   requires both a drive and a root), then all previous segments are ignored and
+   joining continues from the absolute path segment.
 
    On Windows, the drive is not reset when a rooted path segment (e.g.,
    ``r'\foo'``) is encountered. If a segment is on a different drive or is an
