KivyMD 中的 AttributeError 和 TypeError (Python)

Question

我在运行我的 KivyMD 应用程序时遇到了这个错误。我是这个领域的新手，不知道如何解决它，我对此一无所知。但我想防止这个错误。我从互联网上尝试了很多方法。但没有成功。谁能解决这个问题？请...

.kv

MDScreen:
    name: "welcome"
    MDFloatLayout:
        md_bg_color : 1, 1, 1, 1
        Carousel:
            id: carousel
            on_current_slide: app.current_slide(self.index)
            MDFloatLayout:
                Image:
                    source: "Assets/1.png"
                    pos_hint: {"center_x": .5, "center_y": .6}
                MDLabel:
                    text: "1"
                    pos_hint: {"center_y": .087}
            MDFloatLayout:
                Image:
                    source: "Assets/2.png"
                    pos_hint: {"center_x": .5, "center_y": .6}
                MDLabel:
                    text: "2"
                    pos_hint: {"center_y": .087}

.py

class DiaryApp (MDApp):
    def build(self):
        screen_manager = ScreenManager()
        screen_manager.add_widget(Builder.load_file('kv/Diary.kv'))
        return screen_manager

    def on_start(self):
        carousel = self.root.ids.carousel
        carousel.loop = True
        Clock.schedule_interval(carousel.load_next, 3.0)

    def current_slide(self, index):
        pass

    def next(self):
        self.root.ids.carousel.load_next(mode="next")

DiaryApp().run()

错误

 Traceback (most recent call last):
   File "kivy\properties.pyx", line 961, in kivy.properties.ObservableDict.__getattr__
 KeyError: 'carousel'
 
 During handling of the above exception, another exception occurred:
 
 Traceback (most recent call last):
   File "D:\Kusal\Python\Projects\venv\Projects\Diary\Diary.py", line 47, in <module>
     DiaryApp().run()
           .
           .
           .
   File "D:\Kusal\Python\Projects\venv\Projects\Diary\Diary.py", line 22, in next
     self.root.ids.carousel.load_next(mode="next")
   File "kivy\properties.pyx", line 964, in kivy.properties.ObservableDict.__getattr__
 AttributeError: 'super' object has no attribute '__getattr__'

Answer 1

问题是您试图通过 root ids 访问 carousel id，但是 id 是在 MDScreen，这不是 root。解决方法是通过定义它的 MDScreen 访问它：

def on_start(self):
    welcome_screen = self.root.get_screen('welcome')
    carousel = welcome_screen.ids.carousel
    carousel.loop = True
    Clock.schedule_interval(carousel.load_next, 3.0)

KivyMD 中的 AttributeError 和 TypeError (Python)

AttributeError and TypeError in KivyMD (Python)

python

typeerror

attributeerror

kivy

kivymd