Add a note to the docs and fix tests.

kumaraditya303 · Jan 31, 2025 · Jan 5, 2025 · Jan 5, 2025 · Jan 5, 2025 · Jan 5, 2025
commit b545f24c58ffd171843002799e29ade3cd30b578
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
@@ -1269,6 +1269,11 @@ always available.
    Return :const:`True` if the given object is :term:`immortal`, :const:`False`
    otherwise.
 
+   .. note::
+
+      Objects that are immortal (and thus return ``True`` upon being passed to this function)
+      are not guaranteed to be immortal in future versions, and vice versa for mortal objects.
+
    .. versionadded:: next
 
    .. impl-detail::

diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
@@ -713,7 +713,7 @@ def test_43581(self):
         # the test runs under regrtest.
         self.assertEqual(sys.__stdout__.encoding, sys.__stderr__.encoding)
 
-    @unittest.skipUnless(hasattr(sys, "_is_immortal"))
+    @unittest.skipUnless(hasattr(sys, "_is_immortal"), "immortality is not supported")
     def test_immortal(self):
         # Not extensive
         known_immortals = (True, False, None, 0, ())