How to update GUI from a thread?

[kiskivancsi]

I'm trying to update the QLabel in the GUI with the number, generated in a thread. Can this be done?



import threading, random, sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import QtCore, QtTest


def update():
while True:
n = random.randint(0,22)
QtTest.QTest.qWait(500)

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

class MainWindow(QMainWindow):

def __init__(self, *args, **kwargs):
super(MainWindow, self).__init__(*args, **kwargs)
self.setFixedSize(200, 200)

self.labl = QLabel(self)
self.labl.setText("value of n goes here")


app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())

[d_stranz]

The usual way is to have your thread emit a signal that is handled by a slot in the your GUI thread, where you pass the value as an argument in the signal.

This also means you probably need to use QThread for your thread implementation.

[queenelizabeth]

Have same problem