本文介紹了python kivy AttributeError:'super'對象沒有屬性'__getattr__'的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
對于一個項目，我正在嘗試制作一個簡單的 GUI，它顯示一些基本信息(如時間、日期、公共交通信息、一些新聞等).為此，我想要一個顯示所有這些內容概覽的主頁以及每個主題的特殊頁面，并提供詳細視圖.Python 與 Kivy 相結合似乎是最好/最簡單的解決方案，看起來不錯，而且工作起來也很簡單.但是，我在顯示時間時遇到了問題.當我嘗試更新標簽上顯示時間的文本時，我得到一個 AttributeError: 'super' object has no attribute '__getattr__'，這并沒有給我提供太多關于在哪里尋找的信息一個解法.誰能指出哪里出了問題?
for a project I'm trying to make a simple GUI which displays some basic information (like time, date, public transport info, some news etc.) To do this I want a Homepage that displays an overview of all these things and a special page for every subject with a detailed view. Python combined with Kivy seemed like the best/easiest solution that looks good and works quite easy. I am however getting a problem with displaying the time. When I try to update the text on the label that displays the time I get an AttributeError: 'super' object has no attribute '__getattr__', which does not give me much information as to where to look for a solution. Can anyone point out what's wrong?
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
我在運行 main.py 時遇到的錯誤是(我認為這個錯誤的最后兩行左右就足夠了，但你永遠不夠徹底):
The error I get when running main.py is (I think the last two lines or so of this error are enough, but you can never be thorough enough):
[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'
當我將 self.ids["kv_timelabel"].text = str(self.curtime) 替換為 self.ids.kv_timelabel.text = str(self.curtime)代碼> 我明白了:
When I replace self.ids["kv_timelabel"].text = str(self.curtime) with self.ids.kv_timelabel.text = str(self.curtime) I get:
[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__'
請注意，當我刪除錯誤中提到的行時，代碼可以正常工作.
Note that the code works just fine when I delete the line it mentions in the error.
推薦答案
將kv文件的加載移到widget之前.所以調用 Builder.loadfile("mirror.kv") 然后聲明你的類 DateTime 和 HomeScreen (因為它使用 DateTime).您得到的關鍵錯誤可能是因為此小部件還沒有具有該 id 的孩子.
Move the loading of the kv file before the widgets. So call the Builder.loadfile("mirror.kv") and then declare your classes DateTime and HomeScreen (since it uses DateTime). The key error you get is probably because this widget doesn't have a child with that id yet.
這篇關于python kivy AttributeError:'super'對象沒有屬性'__getattr__'的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！
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