How I can run while loop with PyQt5

Question

I work on one Project : Program download but I have a problem with while loop for check the connection with the internet and if true doesn't setText('') to lable and if Flase setText('anyText') to lable

Method for check the connection

    def checkInternetConnection(self,host="8.8.8.8", port=53, timeout=3):

    while self.conection==False:
        try:
            socket.setdefaulttimeout(timeout)
            socket.socket(socket.AF_INET, socket.SOCK_STREAM).connect((host, port))
            self.conection = True
            return self.conection

        except Exception as e:
                print(e)
                self.label_9.setText('Please Check Internect Connection')
                self.conection = False
                return self.conection
    self.finished.emit()

I have tired with QThread . Please How I can do it :) ? And when app is running if connection is lost=False setText('check internet') and when the connection become true setText('')

CONSTRUCTOR

From_Class,_=loadUiType(os.path.join(os.path.dirname(__file__),'designe.ui'))
class mainApp(QMainWindow,From_Class):
    finished = pyqtSignal()
    def __init__(self,parent=None):
        super(mainApp, self).__init__(parent)
        QMainWindow.__init__(self)
        super().setupUi(self)
        self.handleGui()
        self.handleButton()
        self.setWindowIcon(QIcon('mainIcon.png'))
        self.menuBarW()
        self.conection = False

MainCode

def main():
    app = QApplication(sys.argv)
    window = mainApp()
    window.checkInternetConnection()
    window.show()
    app.exec()

if __name__=='__main__':
    main()

Answer 1

Do not get complicated with QThread, use the threading library:

def main():
    app = QtWidgets.QApplication(sys.argv)
    window = mainApp()
    threading.Thread(target=window.checkInternetConnection, daemon=True).start()
    window.show()
    app.exec()

On the other hand, since you are using a thread, you should not update the GUI from another thread, for this you can use QMetaObject::invokeMethod :

def checkInternetConnection(self,host="8.8.8.8", port=53, timeout=3):
    while True:
        try:
            socket.setdefaulttimeout(timeout)
            socket.socket(socket.AF_INET, socket.SOCK_STREAM).connect((host, port))
            self.conection = True
        except Exception as e:
            self.conection = False
            print(e)
        msg = "" if self.conection else 'Please Check Internect Connection'
        print("msg", msg)
        QtCore.QMetaObject.invokeMethod(self.label_9, "setText",
            QtCore.Qt.QueuedConnection,  
            QtCore.Q_ARG(str, msg))
    self.finished.emit()