Only import typing_extensions if necessary (#2232)

Fixes #2231.

Author: lpsinger

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Fix URL joining in Python client (#2228)
 - Handle anyOf/allOf in JSON transforms (#2237)
 - Fix redefining a named Avro type in a diamond dependency pattern (#2238)
+- Fix typing_extensions import errors on Python 3.12 (#2232)
 
 
 ## v2.14.0 - 2026-04-01

src/confluent_kafka/aio/_AIOConsumer.py

@@ -16,8 +16,11 @@
 import concurrent.futures
 from typing import Any, Callable, Dict, Optional, Tuple
 
-# FIXME: import from typing once we depend on Python >= 3.11
-from typing_extensions import Self
+try:
+    from typing import Self
+except ImportError:
+    # FIXME: drop fallback once we require Python >= 3.11
+    from typing_extensions import Self
 
 import confluent_kafka
 

src/confluent_kafka/aio/producer/_AIOProducer.py

@@ -17,8 +17,11 @@
 import logging
 from typing import Any, Callable, Dict, Optional
 
-# FIXME: import from typing once we depend on Python >= 3.11
-from typing_extensions import Self
+try:
+    from typing import Self
+except ImportError:
+    # FIXME: drop fallback once we require Python >= 3.11
+    from typing_extensions import Self
 
 import confluent_kafka
 

src/confluent_kafka/cimpl.pyi

@@ -35,9 +35,13 @@ maintenance burden and get type hints directly from the implementation.
 """
 
 import builtins
-from typing import Any, Callable, Dict, List, Optional, Tuple, Union, overload
+from typing import Any, Callable, Dict, List, Literal, Optional, Tuple, Union, overload
 
-from typing_extensions import Literal, Self
+try:
+    from typing import Self
+except ImportError:
+    # FIXME: drop fallback once we require Python >= 3.11
+    from typing_extensions import Self
 
 from confluent_kafka.admin._metadata import ClusterMetadata, GroupMetadata