[PATCH v2] python: Replace asyncio.get_event_loop for Python 3.14

[PATCH v2] python: Replace asyncio.get_event_loop for Python 3.14

[Richard W.M. Jones]

Updated the patch with the suggestions from Miro Hrončok & Daniel
Berrangé, and retested it with Python 3.14 b4.

Rich.

[PATCH v2] python: Replace asyncio.get_event_loop for Python 3.14

[Richard W.M. Jones]

In Python 3.14, no asyncio event loop gets generated automatically.
Instead create one when we need it.  This should work with Python 3.13
as well.  This change was suggested here:

https://bugzilla.redhat.com/show_bug.cgi?id=2375004#c4

See-also: https://docs.python.org/3.14/whatsnew/3.14.html#id7
Thanks: Miro Hrončok, Daniel P. Berrangé
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
---
 python/qemu/qmp/legacy.py  | 5 ++++-
 python/qemu/qmp/qmp_tui.py | 2 +-
 python/tests/protocol.py   | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/python/qemu/qmp/legacy.py b/python/qemu/qmp/legacy.py
index 22a2b5616e..e11d05afbd 100644
--- a/python/qemu/qmp/legacy.py
+++ b/python/qemu/qmp/legacy.py
@@ -86,7 +86,10 @@ def __init__(self,
                 "server argument should be False when passing a socket")
 
         self._qmp = QMPClient(nickname)
-        self._aloop = asyncio.get_event_loop()
+        try:
+            self._aloop = asyncio.get_event_loop()
+        except RuntimeError:
+            self._aloop = asyncio.new_event_loop()
         self._address = address
         self._timeout: Optional[float] = None
 
diff --git a/python/qemu/qmp/qmp_tui.py b/python/qemu/qmp/qmp_tui.py
index 2d9ebbd20b..7dfb03c9ad 100644
--- a/python/qemu/qmp/qmp_tui.py
+++ b/python/qemu/qmp/qmp_tui.py
@@ -377,7 +377,7 @@ def run(self, debug: bool = False) -> None:
         screen = urwid.raw_display.Screen()
         screen.set_terminal_properties(256)
 
-        self.aloop = asyncio.get_event_loop()
+        self.aloop = asyncio.new_event_loop()
         self.aloop.set_debug(debug)
 
         # Gracefully handle SIGTERM and SIGINT signals
diff --git a/python/tests/protocol.py b/python/tests/protocol.py
index 56c4d441f9..db5d54d83f 100644
--- a/python/tests/protocol.py
+++ b/python/tests/protocol.py
@@ -228,7 +228,7 @@ def async_test(async_test_method):
         Decorator; adds SetUp and TearDown to async tests.
         """
         async def _wrapper(self, *args, **kwargs):
-            loop = asyncio.get_event_loop()
+            loop = asyncio.new_event_loop()
             loop.set_debug(True)
 
             await self._asyncSetUp()
-- 
2.50.1

Re: [PATCH v2] python: Replace asyncio.get_event_loop for Python 3.14

[Daniel P. Berrangé]

On Tue, Jul 15, 2025 at 12:27:52PM +0100, Richard W.M. Jones wrote:
> In Python 3.14, no asyncio event loop gets generated automatically.
> Instead create one when we need it.  This should work with Python 3.13
> as well.  This change was suggested here:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=2375004#c4
> 
> See-also: https://docs.python.org/3.14/whatsnew/3.14.html#id7
> Thanks: Miro Hrončok, Daniel P. Berrangé
> Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
> ---
>  python/qemu/qmp/legacy.py  | 5 ++++-
>  python/qemu/qmp/qmp_tui.py | 2 +-
>  python/tests/protocol.py   | 2 +-
>  3 files changed, 6 insertions(+), 3 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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