update asserts

examples/widgets/roller/lv_example_roller_1.py

@@ -0,0 +1,24 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        option = " "*10
+        obj.get_selected_str(option, len(option))
+        print("Selected month: %s" % option.strip())
+
+roller1 = lv.roller(lv.scr_act())
+roller1.set_options("\n".join([
+                    "January",
+                    "February",
+                    "March",
+                    "April",
+                    "May",
+                    "June",
+                    "July",
+                    "August",
+                    "September",
+                    "October",
+                    "November",
+                    "December"]), lv.roller.MODE.INIFINITE)
+
+roller1.set_visible_row_count(4)
+roller1.align(None, lv.ALIGN.CENTER, 0, 0)
+roller1.set_event_cb(event_handler)