RE: [kivy-users] kivymd AttributeError: 'NoneType' object has noattribute 'ids'
Elliot Garbus
Change:
def PressMe(self):
TestApp().PressMe2()
to:
def PressMe(self):
self.PressMe2()
Your code is creating a new instance of the App. You want to use the self object to select the method in the class.
From: Laurentiu Ion
Sent: Tuesday, September 27, 2022 12:40 PM
To: Kivy users support
Subject: [kivy-users] kivymd AttributeError: 'NoneType' object has noattribute 'ids'
Hello,
I have a simple program that calls a function which updates a text Label. If I call the function by pressing a button it works. However, if I call the function from another function in py file I receive the error in the subject. Could you please tell me how can I call the function from another function so I don't receive the error?
kv file
-----------------
MDBoxLayout:
orientation: 'vertical'
MDScreen:
MDSmartTile:
box_color: 1, 1, 1, .2
pos_hint: {"center_x": .5, "center_y": .5}
size: self.size
MDLabel:
id: p1Label
text:'button is not pressed'
bold: True
font_size: 30
halign: 'center'
valign: 'center'
size_hint_y: None
height: self.texture_size[1]
pos_hint: {'center_x': 0.5, 'center_y': 0.95}
outline_color: (0,0,0)
outline_width: 4
MDRaisedButton:
id: creditButton
text: 'Press me!'
pos_hint: {"center_x": 0.2, "center_y": 0.05}
size_hint: 0.1, 0.05
on_press: app.PressMe()
font_style: 'Button'
py file that works
-----------------------------------------
from kivy.lang import Builder
from kivymd.app import MDApp
class TestApp(MDApp):
def build(self):
self.title = 'TestApp'
self.theme_cls.theme_style = "Dark"
self.theme_cls.primary_palette = "Indigo"
#self.theme_cls.accent_palette = "Red"
return Builder.load_file('test.kv')
def PressMe(self):
self.root.ids.p1Label.text = 'You pressed the button'
TestApp().run()
py file that does not work
-----------------------------------------------
from kivy.lang import Builder
from kivymd.app import MDApp
class TestApp(MDApp):
def build(self):
self.title = 'TestApp'
self.theme_cls.theme_style = "Dark"
self.theme_cls.primary_palette = "Indigo"
#self.theme_cls.accent_palette = "Red"
return Builder.load_file('test.kv')
def PressMe(self):
TestApp().PressMe2()
def PressMe2(self):
self.root.ids.p1Label.text = 'You pressed the button'
TestApp().run()
error
---------------
File "D:\code\python3Workspace\test.py", line 17, in PressMe2 self.root.ids.p1Label.text = 'You pressed the button' AttributeError: 'NoneType' object has no attribute 'ids'
Thanks in advance
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Amine Ben
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