PYTHON-5242 MongoClient does not define all attributes in __init__ (#2249)

Author: sleepyStick

pymongo/asynchronous/mongo_client.py

@@ -91,7 +91,7 @@
 )
 from pymongo.logger import _CLIENT_LOGGER, _log_client_error, _log_or_warn
 from pymongo.message import _CursorAddress, _GetMore, _Query
-from pymongo.monitoring import ConnectionClosedReason
+from pymongo.monitoring import ConnectionClosedReason, _EventListeners
 from pymongo.operations import (
     DeleteMany,
     DeleteOne,
@@ -759,6 +759,8 @@ def __init__(
         self._port = port
         self._topology: Topology = None  # type: ignore[assignment]
         self._timeout: float | None = None
+        self._topology_settings: TopologySettings = None  # type: ignore[assignment]
+        self._event_listeners: _EventListeners | None = None
 
         # _pool_class, _monitor_class, and _condition_class are for deep
         # customization of PyMongo, e.g. Motor.

pymongo/synchronous/mongo_client.py

@@ -83,7 +83,7 @@
 )
 from pymongo.logger import _CLIENT_LOGGER, _log_client_error, _log_or_warn
 from pymongo.message import _CursorAddress, _GetMore, _Query
-from pymongo.monitoring import ConnectionClosedReason
+from pymongo.monitoring import ConnectionClosedReason, _EventListeners
 from pymongo.operations import (
     DeleteMany,
     DeleteOne,
@@ -757,6 +757,8 @@ def __init__(
         self._port = port
         self._topology: Topology = None  # type: ignore[assignment]
         self._timeout: float | None = None
+        self._topology_settings: TopologySettings = None  # type: ignore[assignment]
+        self._event_listeners: _EventListeners | None = None
 
         # _pool_class, _monitor_class, and _condition_class are for deep
         # customization of PyMongo, e.g. Motor.