此处的官方示例显示了如何将小部件旋转一次:from kivy.app import Appfrom kivy.lang import Builderkv = '''FloatLayout: Button: text: 'hello world' size_hint: None, None pos_hint: {'center_x': .5, 'center_y': .5} canvas.before: PushMatrix Rotate: angle: 45 origin: self.center canvas.after: PopMatrix'''class RotationApp(App): def build(self): return Builder.load_string(kv)RotationApp().run()但是如果我想创建一个旋转循环,即如何多次更改角度(并显示结果)?
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