bpo-32528: Document the change in inheritance of asyncio.CancelledError (GH-21474)
GH-msg373510
[bpo-32528]()/GH-13528 changed `asyncio.CancelledError` such that it no longer inherits from `concurrent.futures.CancelledError`. As this affects existing code, specifically when catching the latter instead of the former in exception handling, it should be documented in the "What's new in 3.8?" document.
Automerge-Triggered-By: @1st1
(cherry picked from commit 2a5181829af394b82e8e8c917183c709ee72a2b7)
Co-authored-by: JustAnotherArchivist <JustAnotherArchivist@users.noreply.github.com>
diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index fdfc0a8..61aca47 100644
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -646,7 +646,8 @@
(Contributed by Yury Selivanov in :issue:`37028`.)
The exception :class:`asyncio.CancelledError` now inherits from
-:class:`BaseException` rather than :class:`Exception`.
+:class:`BaseException` rather than :class:`Exception` and no longer inherits
+from :class:`concurrent.futures.CancelledError`.
(Contributed by Yury Selivanov in :issue:`32528`.)
On Windows, the default event loop is now :class:`~asyncio.ProactorEventLoop`.
@@ -1951,7 +1952,8 @@
(Contributed by Anthony Sottile in :issue:`36264`.)
* The exception :class:`asyncio.CancelledError` now inherits from
- :class:`BaseException` rather than :class:`Exception`.
+ :class:`BaseException` rather than :class:`Exception` and no longer inherits
+ from :class:`concurrent.futures.CancelledError`.
(Contributed by Yury Selivanov in :issue:`32528`.)
* The function :func:`asyncio.wait_for` now correctly waits for cancellation