[Python] How do I display terminal output from one python script in another kivy script

I have a python script named "main.py" which basically uses the microphone of the user, recognizes commands and executes a task. If I say "Hello" the script will process this, answer with "Hello" and execute a command like this: print("Hello user!")

What I'm trying to do is display the output or basically the "print" from the main function into the kivy ouput_textbox. I've already asked chatgpt but it still doesn't work. The following code is from the boot.py file which starts the kivy window. The window itself works fine.

def bootEngram(self, instance):
try:
output_textbox = TextInput(
readonly=True,
background_color=(0, 0, 0, 1),
foreground_color="#55ead4",
font_size=14,
font_name=fontFile,
multiline=True
)

command = ["python", "D:\\silverhand\\code\\main.py"]
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, bufsize=1, universal_newlines=True)

def update_output_text(instance, line):
instance.text += line

def read_output():
for line in iter(process.stdout.readline, ''):
Clock.schedule_once(lambda dt: update_output_text(output_textbox, line)) # Sichere UI-Aktualisierung
process.stdout.close()

for err in iter(process.stderr.readline, ''):
Clock.schedule_once(lambda dt: update_output_text(output_textbox, f"Error: {err}"))
process.stdout.close()
process.stderr.close()

process.wait()
Clock.schedule_once(lambda dt: output_popup.dismiss())

threading.Thread(target=read_output, daemon=True).start()

popup_content = BoxLayout(orientation="vertical", spacing = 10)


title_bar = BoxLayout(orientation="horizontal", size_hint_y=None, height=40, padding=(10, 5))

title_label = Label(
text="Engram",
color="#f3e600",
font_name=fontFile,
font_size=20,
bold=True,
halign="left",
size_hint_x = 1,
valign = "middle"
)

close_button = Button(
text="<",
size_hint=(None, None),
size=(30, 30),
background_color=(0, 0, 0, 1),
color=(1, 1, 1, 1),
bold=True,
size_hint_x = None
)

close_button.bind(on_press=lambda x: output_popup.dismiss())
#close_button.bind(on_press=lambda x: process.stdin.write("exit\n"))

title_bar.add_widget(title_label)

popup_content.add_widget(output_textbox)
popup_content.add_widget(close_button)


output_popup = Popup(
title="Engram",
title_color="#f3e600",
title_size=20,
title_font=fontFile,
size_hint=(0.9, 0.9),
separator_color="#c5003c",
#separator_height = 0,
auto_dismiss=False,
content=popup_content
)

output_popup.open()

except Exception as e:
print(f"Error: {e}")

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