pythonGH-78707: Drop deprecated pathlib.PurePath.[is_]relative_to() arguments

Remove support for supplying additional positional arguments to
`PurePath.relative_to()` and `is_relative_to()`. This has been deprecated
since Python 3.12.

Author: barneygale

Doc/whatsnew/3.14.rst

@@ -101,6 +101,13 @@ Deprecated
 Removed
 =======
 
+pathlib
+-------
+
+* Remove support for passing additional positional arguments to
+  :meth:`~pathlib.PurePath.is_relative_to` and
+  :meth:`~pathlib.PurePath.relative_to`. In previous versions, any such
+  arguments are joined onto *other*.
 
 
 Porting to Python 3.14

Lib/pathlib/_local.py

@@ -362,21 +362,15 @@ def with_name(self, name):
         tail[-1] = name
         return self._from_parsed_parts(self.drive, self.root, tail)
 
-    def relative_to(self, other, /, *_deprecated, walk_up=False):
+    def relative_to(self, other, *, walk_up=False):
         """Return the relative path to another path identified by the passed
         arguments.  If the operation is not possible (because this is not
         related to the other path), raise ValueError.
 
         The *walk_up* parameter controls whether `..` may be used to resolve
         the path.
         """
-        if _deprecated:
-            msg = ("support for supplying more than one positional argument "
-                   "to pathlib.PurePath.relative_to() is deprecated and "
-                   "scheduled for removal in Python 3.14")
-            warnings.warn(msg, DeprecationWarning, stacklevel=2)
-            other = self.with_segments(other, *_deprecated)
-        elif not isinstance(other, PurePath):
+        if not isinstance(other, PurePath):
             other = self.with_segments(other)
         for step, path in enumerate(chain([other], other.parents)):
             if path == self or path in self.parents:
@@ -390,16 +384,10 @@ def relative_to(self, other, /, *_deprecated, walk_up=False):
         parts = ['..'] * step + self._tail[len(path._tail):]
         return self._from_parsed_parts('', '', parts)
 
-    def is_relative_to(self, other, /, *_deprecated):
+    def is_relative_to(self, other):
         """Return True if the path is relative to another path or False.
         """
-        if _deprecated:
-            msg = ("support for supplying more than one argument to "
-                   "pathlib.PurePath.is_relative_to() is deprecated and "
-                   "scheduled for removal in Python 3.14")
-            warnings.warn(msg, DeprecationWarning, stacklevel=2)
-            other = self.with_segments(other, *_deprecated)
-        elif not isinstance(other, PurePath):
+        if not isinstance(other, PurePath):
             other = self.with_segments(other)
         return other == self or other in self.parents
 

Lib/test/test_pathlib/test_pathlib.py

@@ -311,19 +311,6 @@ def test_with_stem_empty(self):
         self.assertRaises(ValueError, P('a/b').with_stem, '')
         self.assertRaises(ValueError, P('a/b').with_stem, '.')
 
-    def test_relative_to_several_args(self):
-        P = self.cls
-        p = P('a/b')
-        with self.assertWarns(DeprecationWarning):
-            p.relative_to('a', 'b')
-            p.relative_to('a', 'b', walk_up=True)
-
-    def test_is_relative_to_several_args(self):
-        P = self.cls
-        p = P('a/b')
-        with self.assertWarns(DeprecationWarning):
-            p.is_relative_to('a', 'b')
-
     def test_is_reserved_deprecated(self):
         P = self.cls
         p = P('a/b')