first commit

kivy_venv/share/kivy-examples/guide/designwithkv/controller.kv

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+#:kivy 1.0
+
+<Controller>:
+    label_wid: my_custom_label
+
+    BoxLayout:
+        orientation: 'vertical'
+        padding: 20
+
+        Button:
+            text: 'My controller info is: ' + root.info
+            on_press: root.do_action()
+
+        Label:
+            id: my_custom_label
+            text: 'My label before button press'

kivy_venv/share/kivy-examples/guide/designwithkv/main.py

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+import kivy
+kivy.require('1.0.5')
+
+from kivy.uix.floatlayout import FloatLayout
+from kivy.app import App
+from kivy.properties import ObjectProperty, StringProperty
+
+
+class Controller(FloatLayout):
+    '''Create a controller that receives a custom widget from the kv lang file.
+
+    Add an action to be called from the kv lang file.
+    '''
+    label_wid = ObjectProperty()
+    info = StringProperty()
+
+    def do_action(self):
+        self.label_wid.text = 'My label after button press'
+        self.info = 'New info text'
+
+
+class ControllerApp(App):
+
+    def build(self):
+        return Controller(info='Hello world')
+
+
+if __name__ == '__main__':
+    ControllerApp().run()