fix for event handlers in py3.9 (#4416)

reflex/components/radix/themes/components/segmented_control.py

@@ -12,7 +12,9 @@ from reflex.vars.base import Var
 from ..base import LiteralAccentColor, RadixThemesComponent
 
 
-def on_value_change(value: Var[str | List[str]]) -> Tuple[Var[str | List[str]]]:
+def on_value_change(
+    value: Var[Union[str, List[str]]],
+) -> Tuple[Var[Union[str, List[str]]]]:
     """Handle the on_value_change event.
 
     Args:

reflex/components/radix/themes/components/segmented_control.pyi

@@ -13,7 +13,9 @@ from reflex.vars.base import Var
 
 from ..base import RadixThemesComponent
 
-def on_value_change(value: Var[str | List[str]]) -> Tuple[Var[str | List[str]]]: ...
+def on_value_change(
+    value: Var[Union[str, List[str]]],
+) -> Tuple[Var[Union[str, List[str]]]]: ...
 
 class SegmentedControlRoot(RadixThemesComponent):
     @overload
@@ -118,7 +120,10 @@ class SegmentedControlRoot(RadixThemesComponent):
         custom_attrs: Optional[Dict[str, Union[Var, Any]]] = None,
         on_blur: Optional[EventType[[], BASE_STATE]] = None,
         on_change: Optional[
-            Union[EventType[[], BASE_STATE], EventType[[str | List[str]], BASE_STATE]]
+            Union[
+                EventType[[], BASE_STATE],
+                EventType[[Union[str, List[str]]], BASE_STATE],
+            ]
         ] = None,
         on_click: Optional[EventType[[], BASE_STATE]] = None,
         on_context_menu: Optional[EventType[[], BASE_STATE]] = None,