Python Kivy: Update Label

问题

i am new in the Kivy Topic and i have got a simple question (i think).

With the function "zufall" i create a random number. This number should update every 2 seconds in the label.

But when i am running the code, the error "Label.text accept only str" occurs. But from my opinion i made the "random_number" to a string. Or is there another problem, with my thinking?

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
import random
from kivy.clock import Clock
from kivy.properties import StringProperty


class ConnectPage(GridLayout):
    # runs on initialization
    def zufall(self, *args):

        random_number = random.randrange(10)
        random_number = str(random_number)
        print(random_number)

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols = 2  # used for our grid
        self.add_widget(Label(text='OEE'))
        self.add_widget(Label(text=self.zufall))



class EpicApp(App):
    def build(self):
        t = ConnectPage()
        Clock.schedule_interval(t.zufall, 2)
        return t


if __name__ == "__main__":
    EpicApp().run()

Can someone of you give me a hint?

回答1:

Firstly you have to return your random number from your zufall function, and call that function from your __init__ like this:

    # runs on initialization
    def zufall(self, *args):
        random_number = random.randrange(10)
        random_number = str(random_number)
        return random_number

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols = 2  # used for our grid
        self.add_widget(Label(text='OEE'))
        self.add_widget(Label(text=self.zufall()))

来源：https://stackoverflow.com/questions/60851369/python-kivy-update-label

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python

kivy