Refactor DateRangePicker instantiation in example

Moves DateRangePicker creation outside the button click handler to avoid redundant instantiation. The picker is now created once and reused when the button is clicked.

Author: InesaFitsner

sdk/python/examples/controls/date_range_picker/basic.py

@@ -19,22 +19,18 @@ def handle_dismissal(e: ft.Event[ft.DialogControl]):
 
     today = datetime.datetime.now()
 
+    drp = ft.DateRangePicker(
+        start_value=datetime.datetime(year=today.year, month=today.month, day=1),
+        end_value=datetime.datetime(year=today.year, month=today.month, day=15),
+        on_change=handle_change,
+        on_dismiss=handle_dismissal,
+    )
+
     page.add(
         ft.Button(
             content=ft.Text("Pick date"),
             icon=ft.Icons.PHONE,
-            on_click=lambda e: page.show_dialog(
-                ft.DateRangePicker(
-                    start_value=datetime.datetime(
-                        year=today.year, month=today.month, day=1
-                    ),
-                    end_value=datetime.datetime(
-                        year=today.year, month=today.month, day=15
-                    ),
-                    on_change=handle_change,
-                    on_dismiss=handle_dismissal,
-                )
-            ),
+            on_click=lambda e: page.show_dialog(drp),
         )
     )