imports:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.textinput import TextInput
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import StringProperty
from kivy.properties import ObjectProperty
from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
kv = '''
<Login>
ben: benName.text
pw: passwort.text
knopf: btn
knopff: btnn
GridLayout:
cols: 1
size: root.width,root.height
GridLayout:
cols: 2
Label:
text: "Username"
font_size: 25
TextInput:
id: benName
multiline: False
font_size: 30
Label:
text: "Password"
font_size: 25
bold: True
TextInput:
password: True
id: passwort
multiline: False
font_size: 40
Button:
size_hint: (1.,1.10)
text:" Start "
id: btn
font_size: 40
on_release:
root.manager.current = "Readed" if passwort.text == "1" and benName.text == "1" else "login"
root.manager.transition.direction = "down"
Button:
size_hint: (1.,1.10)
text: " Exit "
id: btnn
font_size: 40
on_release: app.stop()
<readed>:
BoxLayout:
orientation: 'vertical'
TextInput:
id: text_field
Button:
text: 'click'
on_press: app.read()
'''
MyApp
class:
class Login(Screen):
ben = StringProperty()
pw = StringProperty()
knopf = ObjectProperty()
class MyApp(App):
Builder.load_string(kv)
def read(self):
file = open("read.txt", 'r')
f = file.readlines()
self.root.ids.text_field.text = (''.join(f))
text = StringProperty("read.txt")
def build(self):
ms = ScreenManager()
ms.add_widget(Login(name='login'))
ms.add_widget(Readed(name='Readed'))
self.title = "MyApp"
return ms
class Readed(Screen):
pass
if __name__ == '__main__':
MyApp().run()
# her is the erorr
#exec(__kvlang__.co_value, idmap)
#File "<string>", line 59, in <module>
#File "C:\Users\---\--\Desktop\B-PYTHON\----\TEST 45.py", line 93, in read
#self.root.ids.text_field.text = (''.join(f))
#File "kivy\properties.pyx", line 864, in kivy.properties.ObservableDict.__getattr__
#AttributeError: 'super' object has no attribute '__getattr__'
#[Finished in 5.9s with exit code 1]
The line of code:
self.root.ids.text_field.text = (''.join(f))
is trying to access the ids
of the app root. But the app root is the ScreenManager
, which has no ids
(because it does not appear in the kv
). That is what causes the error.
The fix is to access the ids
of the Readed
Screen
, because that is where the text_field
is defined. Try something like:
self.root.get_screen('Readed').ids.text_field = (''.join(f))
Since root
is the ScreenManager
, you can use get_screen()
to get a reference to the Readed
Screen
. Once you have that reference, you can use the ids
defined in the Screen
by the kv
.
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