Add TypeDict object for typehinting for Exception handler callbacks

aiojobs/_scheduler.py

@@ -10,6 +10,7 @@
     Optional,
     Set,
     Type,
+    TypedDict,
     TypeVar,
     Union,
 )
@@ -24,9 +25,26 @@
 
     Self = TypeVar("Self", bound="Scheduler")
 
+
+class ExceptionHandlerDict(TypedDict, total=False):
+    message: str
+    job: Job
+    exception: Exception
+    source_traceback: TracebackType
+
+
+#      * *message*: error message, :class:`str`
+#  * *job*: failed job, :class:`Job` instance
+#  * *exception*: caught exception, :exc:`Exception` instance
+#  * *source_traceback*: a traceback at the moment of job creation
+#    (present only for debug event loops, see also
+#    :envvar:`PYTHONASYNCIODEBUG`).
+
 _T = TypeVar("_T")
 _FutureLike = Union["asyncio.Future[_T]", Awaitable[_T]]
-ExceptionHandler = Callable[["Scheduler", Dict[str, Any]], None]
+ExceptionHandler = Callable[
+    ["Scheduler", Union[ExceptionHandlerDict, Dict[str, Any]]], None
+]
 
 
 class Scheduler(Collection[Job[object]]):
@@ -225,7 +243,9 @@ async def close(self) -> None:
             self._failed_tasks.put_nowait(None)
             await self._failed_task
 
-    def call_exception_handler(self, context: Dict[str, Any]) -> None:
+    def call_exception_handler(
+        self, context: Union[ExceptionHandlerDict, Dict[str, Any]]
+    ) -> None:
         if self._exception_handler is None:
             asyncio.get_running_loop().call_exception_handler(context)
         else: