Почему kivy не находит функцию?

Question

[Леонид К]

есть python 3 код, запущенный на windows 10

import kivy
from kivy.app import App

class IdeApp(App):
	def printer():
		return 'pechat'

IdeApp().run()

есть код на kv (название файла ide.kv)

BoxLayout:
	Label:
		id: hell
		text: 'hello'
	Button:
		text: 'press me'
		on_press: hell.text = IdeApp.printer()

И он при нажатии на кнопку выдает ошибку такую.

Traceback (most recent call last):
   File "ide.py", line 8, in <module>
     IdeApp().run()
   File "C:\Python34\lib\site-packages\kivy\app.py", line 828, in run
     runTouchApp()
   File "C:\Python34\lib\site-packages\kivy\base.py", line 487, in runTouchApp
     EventLoop.window.mainloop()
   File "C:\Python34\lib\site-packages\kivy\core\window\window_sdl2.py", line 619, in mainloop
     self._mainloop()
   File "C:\Python34\lib\site-packages\kivy\core\window\window_sdl2.py", line 362, in _mainloop
     EventLoop.idle()
   File "C:\Python34\lib\site-packages\kivy\base.py", line 330, in idle
     self.dispatch_input()
   File "C:\Python34\lib\site-packages\kivy\base.py", line 315, in dispatch_input
     post_dispatch_input(*pop(0))
   File "C:\Python34\lib\site-packages\kivy\base.py", line 221, in post_dispatch_input
     listener.dispatch('on_motion', etype, me)
   File "kivy\_event.pyx", line 718, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7699)
   File "C:\Python34\lib\site-packages\kivy\core\window\__init__.py", line 1030, in on_motion
     self.dispatch('on_touch_down', me)
   File "kivy\_event.pyx", line 718, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7699)
   File "C:\Python34\lib\site-packages\kivy\core\window\__init__.py", line 1046, in on_touch_down
     if w.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 718, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7699)
   File "C:\Python34\lib\site-packages\kivy\uix\widget.py", line 432, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 718, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7699)
   File "C:\Python34\lib\site-packages\kivy\uix\behaviors\button.py", line 110, in on_touch_down
     self.dispatch('on_press')
   File "kivy\_event.pyx", line 714, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7654)
   File "kivy\_event.pyx", line 1224, in kivy._event.EventObservers.dispatch (kivy\_event.c:13497)
   File "kivy\_event.pyx", line 1108, in kivy._event.EventObservers._dispatch (kivy\_event.c:12329)
   File "C:\Python34\lib\site-packages\kivy\lang.py", line 1557, in custom_callback
     exec(__kvlang__.co_value, idmap)
   File ".\ide.kv", line 7, in <module>
     on_press: hell.text = Ide.printer()
 NameError: name 'Ide' is not defined

Почему?

Answer 1

[shmostertoster]

class IdeApp(App):
  def printer():
    return 'pechat'

IdeApp().run()

Не запускается, Traceback:
NameError: name 'App' is not defined

class IdeApp():
  def printer():
    return 'pechat'

IdeApp().run()

Как он у тебя вообще запустился?

AttributeError: 'IdeApp' object has no attribute 'run'

Ну вот так что-то зафунциклировало...

class IdeApp():
    def printer():
        return 'pechat'

IdeApp()

Дальше у тебя:
on_press: hell.text = IdeApp.printer()
а Traceback:
on_press: hell.text = Ide.printer()

P.S. Не спец, но стало интересно )

Comments

[Леонид К]

Нужно иметь модуль kivy

Answer 2

[PerchikII]

class IdeApp() надо наследовать от App.
Т.е.: class IdeApp(App)