python 3.x - Images disappear when resizing window in Kivy -


i've been following tutorial in kivy , encounter problem. when i'm changing size of window images doesn't display. code is:

from kivy.core.window import window kivy.uix.widget import widget kivy.uix.image import image kivy.app import app  class sprite(image):     def __init__(self, **kwargs):         super().__init__(**kwargs)         self.size = self.texture_size  class game(widget):     def __init__(self):         super().__init__()         self.background = sprite(source="sprites/cartoonforest.png")         self.size = self.background.size         self.add_widget(self.background)  class gameapp(app):     def build(self):         game = game()         window.size = game.size         return game  if __name__ == '__main__':     gameapp().run()

i played around bit, imported different images of different extensions , sizes, changed in code , such, when left out line window.size = game.size in build method in gameapp displayed image. when resized window dragging corner of image disappeared well.

what reason , how fix screen size match image size?

i'm using:

  • mac os x yosemite 10.10.5
  • pycharm community edition 2016.1.4
  • python 3.5.2
  • kivy v1.9.1


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