tabbed panel

tabpanel.py

import kivy
kivy.require('1.8.0')

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.tabbedpanel import TabbedPanelItem

root = Builder.load_string('''
BoxLayout:
    TabbedPanel:
        id: tabpanel
''')

class TestApp(App):
    def build(self):
        root.ids.tabpanel.add_widget(TabbedPanelItem(text='hello'))
        return root

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