bpo-46995: Deprecate missing asyncio.Task.set_name() for third-party task implementations (GH-31838)

Co-authored-by: Kumar Aditya <[email protected]>

Author: asvetlov

Lib/asyncio/tasks.py

@@ -67,7 +67,10 @@ def _set_task_name(task, name):
         try:
             set_name = task.set_name
         except AttributeError:
-            pass
+            warnings.warn("Task.set_name() was added in Python 3.8, "
+                      "the method support will be mandatory for third-party "
+                      "task implementations since 3.13.",
+                      DeprecationWarning, stacklevel=3)
         else:
             set_name(name)
 

Lib/test/test_asyncio/test_tasks.py

@@ -12,7 +12,6 @@
 import textwrap
 import traceback
 import unittest
-import weakref
 from unittest import mock
 from types import GenericAlias
 

Misc/NEWS.d/next/Library/2022-03-12-13-50-42.bpo-46995.2kdNDg.rst

@@ -0,0 +1,2 @@
+Deprecate missing :meth:`asyncio.Task.set_name` for third-party task
+implementations, schedule making it mandatory in Python 3.13.