/usr/share/kivy-examples/guide/designwithkv/controller.kv is in python-kivy-examples 1.9.1-1build3.
This file is owned by root:root, with mode 0o644.
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<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'
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