python - Kivy: change layout when I change orientation -

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i want create changes general layout when orientation, or size, of window changed. in below example, trying 3 buttons. fails, , complains buttons have parent when try add them layout. why have parent? never added them adaptwidget... more importantly, how should achieve want achieve? code below:

from kivy.app import app kivy.uix.widget import widget kivy.uix.button import button kivy.uix.boxlayout import boxlayout  class adaptwidget(boxlayoutwrite failed: broken pipe     def __init__(self, **kw):         super(adaptwidget, self).__init__(**kw)         self.but1 = button(text='but1')         self.but2 = button(text='but2')         self.but3 = button(text='but3')         self.layout = none      def on_size(self, *args):         self.clear_widgets()          if self.size[0] > self.size[1]:             self.layout = boxlayout(orientation='horizontal')             self.but1.size_hint = 0.7, 1              self.layout.add_widget(self.but1)             vert = boxlayout(orientation='vertical')             self.layout.add_widget(vert)             self.but2.size_hint = (1,0.5)             self.but3.size_hint = (1,0.5)             vert.add_widget(self.but2)             vert.add_widget(self.but3)         else:             self.layout = boxlayout(orientation='vertical')             self.but1.size_hint = 1, 0.7             self.layout.add_widget(self.but1)             horiz = boxlayout(oreintation='horizontal')             self.layout.add_widget(horiz)             self.but2.size_hint = 0.5, 1             self.but3.size_hint = 0.5, 1             horiz.add_widget(self.but2)             horiz.add_widget(self.but3)          self.add_widget(self.layout)  class testlayoutapp(app):     def build(self):         return adaptwidget()  if __name__ == '__main__':     testlayoutapp().run()

every time size of adaptwidget changes, on_size callback runs - callback doesn't remove widgets parents, on_size crash second time called. can ensure widget removed parent:

if widget.parent not none:     widget.parent.remove_widget(widget)

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