From ae86201833cc81f41981f7f3af0fea1f06925abe Mon Sep 17 00:00:00 2001
From: Dan Lenski <dlenski@gmail.com>
Date: Wed, 11 Jun 2025 12:30:23 -0700
Subject: [PATCH 1/2] gh-124825: Adding PurePath.erase_parents() to pathlib

The `PurePath.erase_parents()` method remove path components
referring to parent directories ('..').

Unlike `Pure.resolve()`, this occurs without an attempt to verify
the existence or structure of any path components.

See discussion in #124825 for use cases, involving lexical
normalization and simplification of paths without reference to
any particular underlying filesystem.

Issue:

- gh-124825
---
 Lib/pathlib.py | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index 02eb5c25981e31..f753e81f030e4e 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -383,6 +383,27 @@ def with_segments(self, *pathsegments):
         are created from methods like `iterdir()`.
         """
         return type(self)(*pathsegments)
+        
+    def erase_parents(self):
+        r"""
+        Remove path components referring to parent directories ('..'),
+        without any attempt to verify the existence or structure of any
+        path components.
+    
+        If this is a relative path, there may be leftover '..' segments
+        after erasing parent segments. For example:
+    
+        - Path('spam/../../eggs').erase_parents() == Path('../eggs')
+    
+        If this is an absolute path, and it reaches the root filesystem
+        (or the root of a drive or UNC share for Windows paths),
+        further '..' components will be ignored. For example:
+    
+        - Path('/spam/../../../eggs').erase_parents() == Path('/eggs')
+        - PureWindowsPath(r'c:\spam\..\..\eggs').erase_parents() == PureWindowsPath(r'c:\eggs')
+        - PureWindowsPath(r'\\server\share\foo\..\..\eggs').erase_parents() == PureWindowsPath(r'\\server\share\eggs')
+        """
+        return type(self)(self._flavour.normpath(self))
 
     @classmethod
     def _parse_path(cls, path):
@@ -479,7 +500,7 @@ def as_uri(self):
             # It's a posix path => 'file:///etc/hosts'
             prefix = 'file://'
             path = str(self)
-        return prefix + urlquote_from_bytes(os.fsencode(path))
+        return prefix + urlquote_from_bytes(os.fsencode(path)) 
 
     @property
     def _str_normcase(self):

From 1a4be32d2e24a19aed5d62556b7c9254e2c824d5 Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Wed, 11 Jun 2025 19:35:24 +0000
Subject: [PATCH 2/2] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../next/Library/2025-06-11-19-35-18.gh-issue-124825.ta9HSE.rst  | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Library/2025-06-11-19-35-18.gh-issue-124825.ta9HSE.rst

diff --git a/Misc/NEWS.d/next/Library/2025-06-11-19-35-18.gh-issue-124825.ta9HSE.rst b/Misc/NEWS.d/next/Library/2025-06-11-19-35-18.gh-issue-124825.ta9HSE.rst
new file mode 100644
index 00000000000000..e0797a435483f3
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-11-19-35-18.gh-issue-124825.ta9HSE.rst
@@ -0,0 +1 @@
+Added :func:`pathlib.PurePath.erase_parents`, which will remove path components referring to parent directories ('..') without any attempt to verify the existence or structure of any path components.