fix(uagents): support event loop init on Python 3.14

python/src/uagents/agent.py

@@ -94,6 +94,28 @@
 from uagents.utils import get_logger, set_global_log_level
 
 
+def _default_event_loop(
+    loop: asyncio.AbstractEventLoop | None,
+) -> asyncio.AbstractEventLoop:
+    """Resolve the event loop for Agent/Bureau construction.
+
+    Agent and Bureau need a loop during synchronous __init__ (ASGIServer, create_task).
+    Historically, asyncio.get_event_loop() implicitly created a main-thread loop when none
+    existed (Python 3.10-3.13). Python 3.14+ raises RuntimeError instead.
+
+    Order: honor explicit loop=, reuse the thread's loop if set, else create one and
+    register it via set_event_loop() so later get_event_loop() calls on this thread work.
+    """
+    if loop is not None:
+        return loop
+    try:
+        return asyncio.get_event_loop()
+    except RuntimeError:
+        new_loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(new_loop)
+        return new_loop
+
+
 async def _run_interval(
     func: IntervalCallback,
     logger: logging.Logger,
@@ -355,7 +377,8 @@ def __init__(
         self._name = name
         self._port = port or 8000
 
-        self._loop = loop or asyncio.get_event_loop_policy().get_event_loop()
+        # See _default_event_loop: required at init time, not only in run() (Python 3.14+).
+        self._loop = _default_event_loop(loop)
 
         # initialize wallet and identity
         self._initialize_wallet_and_identity(seed, name, wallet_key_derivation_index)
@@ -1572,7 +1595,8 @@ def __init__(
             log_level (int | str): The logging level for the bureau.
             shutdown_timeout (int): The timeout for shutting down the bureau.
         """
-        self._loop = loop or asyncio.get_event_loop_policy().get_event_loop()
+        # See _default_event_loop: same Python 3.14+ loop resolution as Agent.
+        self._loop = _default_event_loop(loop)
         self._agents: list[Agent] = []
         self._port = port or 8000
         self._queries: dict[str, asyncio.Future] = {}

python/tests/test_bureau.py

@@ -22,8 +22,16 @@
 
 class TestBureau(unittest.IsolatedAsyncioTestCase):
     def setUp(self) -> None:
-        self.loop = asyncio.get_event_loop()
-        return super().setUp()
+        # Obtain a loop before super().setUp() so agents can use loop=self.loop.
+        # Python 3.14+ no longer auto-creates a loop on get_event_loop(); mirror
+        # _default_event_loop in agent.py. Do not use get_running_loop() here:
+        # IsolatedAsyncioTestCase has not started the test loop yet in sync setUp.
+        try:
+            self.loop = asyncio.get_event_loop()
+        except RuntimeError:
+            self.loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(self.loop)
+        super().setUp()
 
     def test_bureau_updates_agents_no_ledger_batch(self):
         alice = Agent(name="alice", endpoint=ALICE_ENDPOINT.url, loop=self.loop)