From c3361b272dc6c7c2366670765d263a450126cb2b Mon Sep 17 00:00:00 2001
From: tejaspavanb <tejaspavanb@gmail.com>
Date: Sat, 10 Jan 2026 19:17:54 +0530
Subject: [PATCH 1/2] Fix incorrect AttributeError for invalid AnyValue types
 (#4826)

---
 .../src/opentelemetry/attributes/__init__.py           |  6 +++++-
 opentelemetry-api/tests/attributes/test_attributes.py  | 10 ++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/opentelemetry-api/src/opentelemetry/attributes/__init__.py b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
index 5116c2fdd8..5f9e93760b 100644
--- a/opentelemetry-api/src/opentelemetry/attributes/__init__.py
+++ b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
@@ -36,6 +36,10 @@
 )
 
 
+def _type_name(t):
+    return getattr(t, "__name__", getattr(t, "_name", repr(t)))
+
+
 _logger = logging.getLogger(__name__)
 
 
@@ -190,7 +194,7 @@ def _clean_extended_attribute_value(  # pylint: disable=too-many-branches
     except Exception:
         raise TypeError(
             f"Invalid type {type(value).__name__} for attribute value. "
-            f"Expected one of {[valid_type.__name__ for valid_type in _VALID_ANY_VALUE_TYPES]} or a "
+            f"Expected one of {[_type_name(valid_type) for valid_type in _VALID_ANY_VALUE_TYPES]} or a "
             "sequence of those types",
         )
 
diff --git a/opentelemetry-api/tests/attributes/test_attributes.py b/opentelemetry-api/tests/attributes/test_attributes.py
index 8cb6f35fbc..31bf216be5 100644
--- a/opentelemetry-api/tests/attributes/test_attributes.py
+++ b/opentelemetry-api/tests/attributes/test_attributes.py
@@ -15,12 +15,14 @@
 # type: ignore
 
 import unittest
+import unittest.mock
 from typing import MutableSequence
 
 from opentelemetry.attributes import (
     BoundedAttributes,
     _clean_attribute,
     _clean_extended_attribute,
+    _clean_extended_attribute_value,
 )
 
 
@@ -320,3 +322,11 @@ def __str__(self):
         self.assertEqual(
             "<DummyWSGIRequest method=GET path=/example/>", cleaned_value
         )
+
+    def test_invalid_anyvalue_type_raises_typeerror(self):
+        class BadStr:
+            def __str__(self):
+                raise Exception("boom")
+
+        with self.assertRaises(TypeError):
+            _clean_extended_attribute_value(BadStr(), None)

From ff91815cc2780ef343710358c24358d850ecaf4a Mon Sep 17 00:00:00 2001
From: tejaspavanb <tejaspavanb@gmail.com>
Date: Thu, 22 Jan 2026 20:50:39 +0530
Subject: [PATCH 2/2] Add TODO to remove Python 3.9 workaround after
 deprecation

---
 opentelemetry-api/src/opentelemetry/attributes/__init__.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/opentelemetry-api/src/opentelemetry/attributes/__init__.py b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
index 5f9e93760b..d5ffbf824b 100644
--- a/opentelemetry-api/src/opentelemetry/attributes/__init__.py
+++ b/opentelemetry-api/src/opentelemetry/attributes/__init__.py
@@ -36,6 +36,9 @@
 )
 
 
+# TODO: Remove this workaround and revert to the simpler implementation
+# once Python 3.9 support is dropped (planned around May 2026).
+# This exists only to avoid issues caused by deprecated behavior in 3.9.
 def _type_name(t):
     return getattr(t, "__name__", getattr(t, "_name", repr(t)))