python kivy AttributeError：＆＃39; super＆＃39;对象没有属性＆＃39; __ getattr __＆＃39;

时间：2016-04-17 17:48:49

标签： python kivy

对于一个项目，我试图制作一个简单的GUI，显示一些基本信息（如时间，日期，公共交通信息，一些新闻等）。要做到这一点，我想要一个显示所有概述的主页这些东西和每个主题的特殊页面都有详细的视图。 Python与Kivy相结合似乎是最好/最简单的解决方案，看起来很好并且非常容易。但是我在显示时间方面遇到了问题。当我尝试更新标签上的文本时，显示我得到AttributeError: 'super' object has no attribute '__getattr__'的时间，这并没有给我提供关于在哪里寻找解决方案的信息。任何人都可以指出错误吗？

main.py：

import feedparser
import time
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.anchorlayout import AnchorLayout
from kivy.properties import NumericProperty, ReferenceListProperty, ObjectProperty, StringProperty
from kivy.uix.label import Label
from kivy.uix.widget import Widget
from kivy.clock import Clock

# Declare widgets
class DateTime(Widget):
    curtime = StringProperty('')

    def update(self, dt):
        self.curtime = time.strftime("%H:%M:%S")
        print self.curtime
        self.ids["kv_timelabel"].text = str(self.curtime)

# Declare all screens
class HomeScreen(Screen):
    obj_datetime = DateTime()
    Clock.schedule_interval(obj_datetime.update, 1.0 / 10.0)

class NewsScreen(Screen):
    pass

class PublicTransportScreen(Screen):
    pass

class TrafficScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

class MirrorApp(App):
    def build(self):
        # Create the screen manager
        render = ScreenManagement()
        render.add_widget(HomeScreen(name='home'))
        render.add_widget(TrafficScreen(name='traffic'))
        render.add_widget(PublicTransportScreen(name='public_transport'))
        render.add_widget(NewsScreen(name='news'))
        return render

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

mirror.kv：

#:kivy 1.9.0

<HomeScreen>:
    name: 'home'
    obj_datetime: kv_datetime

    Button:
        on_release: app.root.current = 'news'
        text: 'News'
        size_hint: 0.5,0.15
        font_size: 50
        pos_hint: {"left":1, "top":0.15}

    Button:
        on_release: app.root.current = 'public_transport'
        text: 'Public Transport'
        size_hint: 0.5,0.15
        font_size: 50
        pos_hint: {"left":1, "top":0.3}

    Button:
        on_release: app.root.current = 'traffic'
        text: 'Traffic'
        size_hint: 0.5,0.15
        font_size: 50
        pos_hint: {"left":1, "top":0.45}

    DateTime:
        id: kv_datetime
        center: self.parent.center

<NewsScreen>:
    name: 'news'

    Button:
        on_release: app.root.current = 'home'
        text: 'back to the home screen'
        font_size: 50

<PublicTransportScreen>:
    name: 'public_transport'

    Button:
        on_release: app.root.current = 'home'
        text: 'back to the home screen'
        font_size: 50

<TrafficScreen>:
    name: 'traffic'

    Button:
        on_release: app.root.current = 'home'
        text: 'back to the home screen'
        font_size: 50

<DateTime>:
    Label:
        id: kv_timelabel
        text:
        font_size: 70  
        center_x: self.parent.center_x
        center_y: self.parent.center_y

运行main.py时遇到的错误是（我认为这个错误的最后两行左右就足够了，但你永远不够彻底）：

[INFO   ] [Logger      ] Record log in /home/matthias/.kivy/logs/kivy_16-04-17_97.txt
[INFO   ] [Kivy        ] v1.9.0
[INFO   ] [Python      ] v2.7.10 (default, Oct 14 2015, 16:09:02) 
[GCC 5.2.1 20151010]
[INFO   ] [Factory     ] 173 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 11.0.2>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) Ivybridge Mobile >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event5
[INFO   ] [MTD         ] Read event from </dev/input/event5>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
19:39:33
[INFO   ] [Base        ] Leaving application in progress...
 Traceback (most recent call last):
   File "main.py", line 49, in <module>
     MirrorApp().run()
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 824, in run
 Exception in thread Thread-1:
     runTouchApp()
 Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 487, in runTouchApp
     EventLoop.window.mainloop()
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 525, in mainloop
     self.run()
     self._mainloop()
   File "/usr/lib/python2.7/threading.py", line 763, in run
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 290, in _mainloop
     self.__target(*self.__args, **self.__kwargs)
     EventLoop.idle()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 327, in idle
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 197, in _thread_run
     Clock.tick()
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 483, in tick
     self._process_events()
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 615, in _process_events
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 OSError: [Errno 13] Permission denied: '/dev/input/event5'

     event.tick(self._last_tick, remove)
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 374, in tick
     ret = callback(self._dt)
   File "main.py", line 19, in update
     self.ids["kv_timelabel"].text = str(self.curtime)
 KeyError: 'kv_timelabel'

当我用self.ids["kv_timelabel"].text = str(self.curtime)替换self.ids.kv_timelabel.text = str(self.curtime)时，我得到：

[INFO   ] [Logger      ] Record log in 
/home/matthias/.kivy/logs/kivy_16-04-17_98.txt
[INFO   ] [Kivy        ] v1.9.0
[INFO   ] [Python      ] v2.7.10 (default, Oct 14 2015, 16:09:02) 
[GCC 5.2.1 20151010]
[INFO   ] [Factory     ] 173 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 11.0.2>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) Ivybridge Mobile >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event5
[INFO   ] [MTD         ] Read event from </dev/input/event5>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
19:42:01
[INFO   ] [Base        ] Leaving application in progress...
 Traceback (most recent call last):
   File "main.py", line 49, in <module>
 Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
     self.run()
   File "/usr/lib/python2.7/threading.py", line 763, in run
     MirrorApp().run()
     self.__target(*self.__args, **self.__kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 824, in run
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 197, in _thread_run
     runTouchApp()
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 487, in runTouchApp
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     EventLoop.window.mainloop()
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 525, in mainloop
 OSError: [Errno 13] Permission denied: '/dev/input/event5'
     self._mainloop()

   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 290, in _mainloop
     EventLoop.idle()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 327, in idle
     Clock.tick()
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 483, in tick
     self._process_events()
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 615, in _process_events
     event.tick(self._last_tick, remove)
   File "/usr/lib/python2.7/dist-packages/kivy/clock.py", line 374, in tick
     ret = callback(self._dt)
   File "main.py", line 19, in update
     self.ids.kv_timelabel.text = str(self.curtime)
   File "kivy/properties.pyx", line 720, in kivy.properties.ObservableDict.__getattr__ (kivy/properties.c:10938)
 AttributeError: 'super' object has no attribute '__getattr__'

请注意，当我删除错误中提及的行时，代码才能正常工作。

1 个答案:

答案 0 :(得分：0)

在小部件之前移动kv文件的加载。因此，请调用Builder.loadfile("mirror.kv")，然后声明您的班级DateTime和HomeScreen（因为它使用DateTime）。您获得的关键错误可能是因为此窗口小部件还没有具有该ID的子窗口。

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