gh-155040: Support copy.replace() for tarfile.TarInfo (GH-155046)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Doc/library/tarfile.rst

@@ -963,6 +963,11 @@ A ``TarInfo`` object has the following public data attributes:
    If *deep* is false, the copy is shallow, i.e. ``pax_headers``
    and any custom attributes are shared with the original ``TarInfo`` object.
 
+   This method is also used by :func:`copy.replace`.
+
+   .. versionchanged:: next
+      Added support for :func:`copy.replace`.
+
 A :class:`TarInfo` object also provides some convenient query methods:
 
 

Lib/tarfile.py

@@ -1036,6 +1036,8 @@ def replace(self, *,
             result.gname = gname
         return result
 
+    __replace__ = replace
+
     def get_info(self):
         """Return the TarInfo's attributes as a dictionary.
         """

Lib/test/test_tarfile.py

@@ -1,3 +1,4 @@
+import copy
 import errno
 import sys
 import os
@@ -3524,6 +3525,16 @@ def test_replace_internal(self):
         with self.assertRaises(TypeError):
             member.replace(offset=123456789)
 
+    def test_copy_replace(self):
+        member = self.tar.getmember('ustar/regtype')
+        replaced = copy.replace(member, name='misc/other', mode=0o644)
+        self.assertEqual(replaced.name, 'misc/other')
+        self.assertEqual(replaced.mode, 0o644)
+        self.assertEqual(replaced.size, member.size)
+        self.assertEqual(member.name, 'ustar/regtype')
+        with self.assertRaises(TypeError):
+            copy.replace(member, offset=123456789)
+
 
 class NoneInfoExtractTests(ReadTest):
     # These mainly check that all kinds of members are extracted successfully

Misc/NEWS.d/next/Library/2026-08-01-19-01-00.gh-issue-155040.Tr1nFo.rst

@@ -0,0 +1 @@
+:class:`tarfile.TarInfo` objects now support :func:`copy.replace`.