Update event call to give the var name.

Add the variable name to value_change events so we can use
a single handler to handle a set of variables.

lib/level/level.py

@@ -32,18 +32,20 @@ class EventList:
         self.events = defaultdict(set)
         self.variables = variables
 
-    def connect(self, event: str, function: Callable[[Any], None]) -> None:
+    def connect(self, event: str, function: Callable[[str, Any], None]) -> None:
         """
         Connect a function to an event.
 
         :param event: The name of the event to listen.
-        :param function: The function to call with the updated value.
+        :param function: The function to call on update. Receives two arguments
+                         that are the variable that has been updated
+                         and the updated value.
         """
         self.events[event].add(function)
 
     def disconnect(
         self,
-        function: Callable[[Any], None],
+        function: Callable[[str, Any], None],
         event: Optional[str] = None
     ) -> None:
         """
@@ -67,7 +69,7 @@ class EventList:
         """
         for variable in variable_list:
             for function in self.events[f"value_change:{variable}"]:
-                function(self.variables[variable])
+                function(variable, self.variables[variable])
 
     def trigger(self, event: str, *args: Optional[list[Any]]) -> None:
         """

lib/tests/auto/value_change_event/main.py

@@ -9,8 +9,7 @@ from level.level import level
 # List that stores and the values of the variable that we watch
 VALUES = []
 
-
-def event_callback(new_value: int) -> None:
+def event_callback(var: str, new_value: int) -> None:
     """
     Append the new value to the global list
     when a value_change event is received.