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

[hauntsaninja]

https://github.com/python/cpython/commit/909a6746939ea1d09fab21f26b558cfd7e3e29a0
commit: 909a6746939ea1d09fab21f26b558cfd7e3e29a0
branch: main
author: Shantanu <12621235+hauntsaninja at users.noreply.github.com>
committer: hauntsaninja <12621235+hauntsaninja at users.noreply.github.com>
date: 2023-01-30T21:39:30-08:00
summary:

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

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.

files:
M Doc/library/os.path.rst

diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 786c2fd7f64f..96bcb48ad7d1 100644
--- 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