Sample to put Python Kivy in one file

#-*- coding: utf-8 -*-

from kivy.lang import Builder
Builder.load_string("""
<TextWidget>:
	BoxLayout:
		orientation: 'vertical'
		size: root.size

		TextInput:
			text: root.text

		Button:
			id: button1
			text: "OK"
			font_size: 48
			on_press: root.buttonClicked()
""")

from kivy.app import App
from kivy.uix.widget import Widget

from kivy.properties import StringProperty 

class TextWidget(Widget):
	text = StringProperty()

	def __init__(self, **kwargs):
		super(TextWidget, self).__init__(**kwargs)
		self.text = ''

	def buttonClicked(self):
		for i in range(5):
			self.text += str(i) + '\n'

class TestApp(App):
	def __init__(self, **kwargs):
		super(TestApp, self).__init__(**kwargs)
		self.title = 'greeting'

	def build(self):
		return TextWidget()

if __name__ == '__main__':
	TestApp().run()

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