pep-484: asyncio

in this patch the asyncio/events.py module, which
existed only to raise errors when trying to attach event
listeners, is removed, as we were already coding an asyncio-specific
workaround in upstream Pool / Session to raise this error,
just moved the error out to the target and did the same thing
for Engine.

We also add an async_sessionmaker class.  The initial rationale
here is because sessionmaker() is hardcoded to Session subclasses,
and there's not a way to get the use case of
sessionmaker(class_=AsyncSession) to type correctly without changing
the sessionmaker() symbol itself to be a function and not a class,
which gets too complicated for what this is. Additionally,
_SessionClassMethods has only three methods on it, one of which
is not usable with asyncio (close_all()), the others
not generally used from the session class.

Change-Id: I064a5fa5d91cc8d5bbe9597437536e37b4e801fe

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index c85861a59..abe11cc68 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -132,6 +132,8 @@ class Mapper(
     _identity_class: Type[_O]
 
     always_refresh: bool
+    allow_partial_pks: bool
+    version_id_col: Optional[ColumnElement[Any]]
 
     @util.deprecated_params(
         non_primary=(
@@ -2931,7 +2933,7 @@ class Mapper(
         self,
         state: InstanceState[_O],
         dict_: _InstanceDict,
-        column: Column[Any],
+        column: ColumnElement[Any],
         passive: PassiveFlag = PassiveFlag.PASSIVE_RETURN_NO_VALUE,
     ) -> Any:
         prop = self._columntoproperty[column]