Change TextInput to display only function for Kivy Python - python-3.x

Question

I'm still new to kivy and still relatively new to Python.
I have main. py. I plan to have WindowGUI take a number of inputs from main.py and display them in its textbox.
Here is what I have:
from os import curdir
from posixpath import dirname
import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout # one of many layout structures
from kivy.uix.textinput import TextInput # allow for ...text input.
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.uix.spinner import Spinner
from kivy.uix.dropdown import DropDown
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import ObjectProperty
kivy.require('2.0.0')
class MainGUI(Screen):
encoder = ObjectProperty()
mileage = ObjectProperty()
voltage = ObjectProperty()
power = ObjectProperty()
camera = ObjectProperty()
engaged = ObjectProperty()
idle = ObjectProperty()
log = ObjectProperty()
clear = ObjectProperty()
status = ObjectProperty(None)
def __init__(self, saySomething):
super().__init__() #Go up to __init__ of App
self.saySomething = saySomething
def power_option(self):
self.power.text = "Power"
def print_status(self):
self.ids.Status_screen.text = self.saySomething
return self.ids.Status_screen.text
class CameraGUI(Screen):
def __init__(self, **kwargs): #kwargs is just a variable. it could be "banana" or "apple"
super().__init__() #Go up to __init__ of App
class GUIManager(ScreenManager):
pass
kv = Builder.load_file('newWindow.kv')
class WindowGUI(App):
def __init__(self):
super().__init__()
# self.say = say
print("TRY ME!!!!")
def build(self):
self.title = 'IamHero'
return kv
if __name__ == '__main__':
myWindowGUI = WindowGUI()
myMainGUI = MainGUI('I am hero!')
myWindowGUI.run()
###########################_newWindow.kv_#############################
GUIManager:
MainGUI:
CameraGUI:
<MainGUI>:
name: "main"
status: Status_screen
GridLayout:
cols: 2
size: root.width, root.height #covers entire window
padding: 15
GridLayout:
cols:1
spacing: 10
GridLayout:
cols:2
size_hint: .25,.1
Label:
id: Engaged
text: "Engaged"
Label:
id: Idle
text: "Idle"
TextInput:
# size_hint: 1
id: Status_screen
multiline: True
readonly: True
background_color: .6, .7, 0, 1
text: root.print_status()
#on_text: root.print_status()
GridLayout:
cols:2
size_hint: .25,.1
Button:
id: Log
text: "Log status"
# size_hint_x: .5
Button:
id: Clear
text: "Clear"
However, I got the following error:
Traceback (most recent call last):
File "c:/Users/Jojo/#RaspberryPi4/Test/WindowGUI.py", line 57, in <module>
kv = Builder.load_file('newWindow.kv')
File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 306, in load_file
return self.load_string(data, **kwargs)
File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 408, in load_string
self._apply_rule(
File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 659, in _apply_rule
child = cls(__no_builder=True)
TypeError: __init__() got an unexpected keyword argument '__no_builder'
Any ideas about what I did wrong?

Answer 1

You cannot require a positional argument in the __init__() of a class that you intend to use in kv. Your __init__() for MainGUI:
def __init__(self, saySomething):
requires an argument for saySomething. An easy way around that is to just make saySomething into a StringProperty of MainGUI. Then you don't even need to implement an __init__():
class MainGUI(Screen):
encoder = ObjectProperty()
mileage = ObjectProperty()
voltage = ObjectProperty()
power = ObjectProperty()
camera = ObjectProperty()
engaged = ObjectProperty()
idle = ObjectProperty()
log = ObjectProperty()
clear = ObjectProperty()
status = ObjectProperty(None)
saySomething = StringProperty('Hi')
# def __init__(self, saySomething):
# super().__init__() #Go up to __init__ of App
# self.saySomething = saySomething
Then you can set the value of saySomething just like any other property in the kv:
<MainGUI>:
name: "main"
status: Status_screen
saySomething: 'I am hero!'
or in python you can do:
MainGUI(saySomething='I am hero!')
Also, the line:
myMainGUI = MainGUI('I am hero!')
(which will no longer work) is creating an instance of MainGUI that is unused. So that line of code can be deleted.