[3.12] GH-99334: Explain that `PurePath.is_relative_to()` is purely lexical. (GH...

(cherry picked from commit 3a61d24062aaa1e13ba794360b6c765d9a1f2b06)

diff --git a/Doc/library/pathlib.rst b/Doc/library/pathlib.rst
index 46a4d10b11d6024648ec4794e5d7aa6986e4574c..701131b5b2ec46300c20c3217a8accbb3393516e 100644 (file)
--- a/Doc/library/pathlib.rst
+++ b/Doc/library/pathlib.rst
@@ -509,6 +509,13 @@ Pure paths provide the following methods and properties:
       >>> p.is_relative_to('/usr')
       False
 
+   This method is string-based; it neither accesses the filesystem nor treats
+   "``..``" segments specially. The following code is equivalent:
+
+      >>> u = PurePath('/usr')
+      >>> u == p or u in p.parents
+      False
+
    .. versionadded:: 3.9
 
    .. deprecated-removed:: 3.12 3.14