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kivy_venv/share/kivy-examples/kv/ids/kv_and_py/kv_and_py.py

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+'''
+Referring on ids from Python
+=============================
+
+This example shows how to refer to an id from a Python file.
+'''
+
+import kivy
+kivy.require('1.8.0')
+
+from kivy.app import App
+from kivy.uix.boxlayout import BoxLayout
+
+
+class RootWidget(BoxLayout):
+
+    def first_function(self, status):
+        # print out the given parameter
+        print(status)
+        # check the status of the switch by referring on the id
+        if self.ids.my_switch.active is True:
+            # set the text of the label by referring on the id
+            self.ids.my_label.text = 'Switch is ON'
+        else:
+            # set the text of the label by referring on the id
+            self.ids.my_label.text = 'Switch is OFF'
+
+
+class TestApp(App):
+    pass
+
+
+if __name__ == '__main__':
+    TestApp().run()

kivy_venv/share/kivy-examples/kv/ids/kv_and_py/test.kv

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+#:kivy 1.8.0
+
+RootWidget:
+    BoxLayout:
+        orientation: 'vertical'
+        Switch:
+            id: my_switch
+            on_active: root.first_function(self.active)
+        Label:
+            id: my_label
+            text: 'This text will be changed by the python file'