I want to make a 2 page Kivy app - input a word, output definition on another screen. I tried Kivy, it worked. Now I used KivyMD. I encountered NameError.
Traceback (most recent call last):
File "C:/Users/Andrew/PycharmProjects/JesscarlettApp/dictapp.py", line 94, in <module>
TestApp().run()
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\app.py", line 950, in run
runTouchApp()
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\base.py", line 582, in runTouchApp
EventLoop.mainloop()
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\base.py", line 347, in mainloop
self.idle()
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\base.py", line 391, in idle
self.dispatch_input()
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\base.py", line 342, in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\base.py", line 308, in post_dispatch_input
wid.dispatch('on_touch_up', me)
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivymd\uix\behaviors\ripplebehavior.py", line 245, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivymd\uix\button.py", line 969, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\uix\behaviors\button.py", line 179, in on_touch_up
self.dispatch('on_release')
File "kivy\_event.pyx", line 705, in kivy._event.EventDispatcher.dispatch
File "kivy\_event.pyx", line 1248, in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx", line 1132, in kivy._event.EventObservers._dispatch
File "C:\Users\Andrew\PycharmProjects\JesscarlettApp\lib\site-packages\kivy\lang\builder.py", line 57, in custom_callback
exec(__kvlang__.co_value, idmap)
File "<string>", line 24, in <module>
NameError: name 'meaning' is not defined
This is my main.py and kv. (please ignore those additional unused modules.) The issue is of this line "meaning.text = app.show_data_meaning()" in the kv. But I just don't know how to fix it. Many thanks.
from kivy.app import App
from kivymd.uix.screen import Screen
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.textfield import MDTextField
from kivy.lang import Builder
from kivy.uix.label import Label
from kivymd.uix.button import MDRectangleFlatButton
from kivy.core.window import Window
from kivy.uix.image import Image, AsyncImage
from kivymd.app import MDApp
from PyDictionary import PyDictionary
from bs4 import BeautifulSoup as bs
from kivymd.uix.label import MDLabel
class WordScreen(Screen):
pass
class MeaningScreen(Screen):
pass
screen_helper = """
ScreenManager:
id: screen_manager
WordScreen:
MeaningScreen:
<WordScreen>
name: 'wordscreen'
MDTextField:
hint_text: "Word"
id: text_field
text:'default'
icon_right: "dictionary"
icon_right_color: app.theme_cls.primary_color
pos_hint: {'center_x':0.5, 'center_y':0.9}
size_hint_x:None
width:300
MDRectangleFlatButton:
text: 'search'
id: search_button
pos_hint: {'center_x': 0.5, 'center_y': 0.8}
on_release:
meaning.text = app.show_data_meaning()
root.manager.current = 'meaningscreen'
<MeaningScreen>
name: 'meaningscreen'
MDRectangleFlatButton:
text: 'back'
pos_hint: {'center_x': 0.5, 'center_y': 0.2}
on_release: root.manager.current = 'wordscreen'
MDLabel:
text: "Default"
id: meaning
halign: 'center'
theme_text_color: 'Secondary'
font_style: 'Body1'
pos_hint: {'center_x': 0.5, 'center_y': 0.6}
"""
class TestApp(MDApp):
def __init__(self, **kwargs):
self.title = "Dictionary App"
self.theme_cls.primary_palette = "Blue"
super().__init__(**kwargs)
def build(self):
sm = Builder.load_string(screen_helper)
return sm
def show_data_meaning(self):
searchword = self.root.get_screen("wordscreen").ids.text_field.text
print(searchword)
dictionary = PyDictionary(searchword)
meaning = dictionary.getMeanings()
print(meaning)
return meaning
if __name__ == '__main__':
TestApp().run()
You can make a new method in your TestApp to set the text on the next screen
example:
def my_func(self):
self.root.get_screen("meaningscreen").ids.meaning.text = str(self.show_data_meaning())
and call your method in button release
on_release:
app.my_func()
root.manager.current = 'meaningscreen'
you can also do this in kv file as well, you just need to get meaningscreen
then meaningscreen.ids.text_field.meaning.text = app.show_data_meaning()
here is your code after changes
from kivy.app import App
from kivymd.uix.screen import Screen
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.textfield import MDTextField
from kivy.lang import Builder
from kivy.uix.label import Label
from kivymd.uix.button import MDRectangleFlatButton
from kivy.core.window import Window
from kivy.uix.image import Image, AsyncImage
from kivymd.app import MDApp
from PyDictionary import PyDictionary
from bs4 import BeautifulSoup as bs
from kivymd.uix.label import MDLabel
class WordScreen(Screen):
pass
class MeaningScreen(Screen):
pass
screen_helper = """
ScreenManager:
id: screen_manager
WordScreen:
MeaningScreen:
<WordScreen>
name: 'wordscreen'
MDTextField:
hint_text: "Word"
id: text_field
text:'default'
icon_right: "dictionary"
icon_right_color: app.theme_cls.primary_color
pos_hint: {'center_x':0.5, 'center_y':0.9}
size_hint_x:None
width:300
MDRectangleFlatButton:
text: 'search'
id: search_button
pos_hint: {'center_x': 0.5, 'center_y': 0.8}
on_release:
app.my_func()
root.manager.current = 'meaningscreen'
<MeaningScreen>
name: 'meaningscreen'
MDRectangleFlatButton:
text: 'back'
pos_hint: {'center_x': 0.5, 'center_y': 0.2}
on_release: root.manager.current = 'wordscreen'
MDLabel:
text: "Default"
id: meaning
halign: 'center'
theme_text_color: 'Secondary'
font_style: 'Body1'
pos_hint: {'center_x': 0.5, 'center_y': 0.6}
"""
class TestApp(MDApp):
def __init__(self, **kwargs):
self.title = "Dictionary App"
self.theme_cls.primary_palette = "Blue"
super().__init__(**kwargs)
def build(self):
sm = Builder.load_string(screen_helper)
return sm
def show_data_meaning(self):
searchword = self.root.get_screen("wordscreen").ids.text_field.text
print(searchword)
dictionary = PyDictionary(searchword)
meaning = dictionary.getMeanings()
print(meaning)
return meaning
def my_func(self):
self.root.get_screen("meaningscreen").ids.meaning.text = str(self.show_data_meaning())
if __name__ == '__main__':
TestApp().run()