update asserts

examples/widgets/btn/lv_example_btn_1.py

@@ -0,0 +1,21 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.CLICKED:
+        print("Clicked")
+
+btn1 = lv.btn(lv.scr_act())
+btn1.set_event_cb(event_handler)
+btn1.align(None, lv.ALIGN.CENTER, 0, -40)
+
+label = lv.label(btn1)
+label.set_text("Button")
+
+btn2 = lv.btn(lv.scr_act())
+# callback can be lambda:
+btn2.set_event_cb(lambda obj, event: print("Toggled") if event == lv.EVENT.VALUE_CHANGED else None)
+btn2.align(None, lv.ALIGN.CENTER, 0, 40)
+btn2.set_toggle(True)
+btn2.toggle()
+btn2.set_fit2(lv.FIT.NONE, lv.FIT.TIGHT)
+
+label = lv.label(btn2)
+label.set_text("Toggled")