Что поменять, что бы интерфейс не блокировался?

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from subprocess import Popen,PIPE
import sys


lock = QReadWriteLock()

class Worker(QThread):
    runping = pyqtSignal()
    def __init__(self,parent = None ):
        QThread.__init__(self,parent)

    def run(self):
        self.runping.emit()

class MainWindow(QMainWindow):
    def __init__(self,*args,**kwargs):
        super(MainWindow,self).__init__(*args,**kwargs)
        self.initUI()

    def initUI(self):
        self.width = 600
        self.height = 600
        self.resize(self.width,self.height)
        self.center()
        self.ipField = QLineEdit(self)
        self.ipField.setText('127.1.1.0')
        self.ipField.setGeometry(10,10,100,25)
        self.button = QPushButton("ping",self)
        self.button.setGeometry(120,10,100,25)
        self.button.clicked.connect(self.onPressPing)
        self.console = QPlainTextEdit(self)
        self.console.setGeometry(5,50,self.width-10,self.height-60)
        self.setWindowTitle('Ping from os')
        self.w = Worker()
        self.w.runping.connect(self.OnPing)
        self.show()

    def onPressPing(self):
        self.w.run()


    def OnPing(self):
        lock.lockForWrite()
        ip = self.ipField.text()
        lock.unlock()
        res  = self.pingFromOS('localhost')
        lock.lockForWrite()
        self.console.appendPlainText(res)
        lock.unlock()


    def center(self):
        qr = self.frameGeometry()
        cp = QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

    def pingFromOS(self,ip):
        if ip is None:
            return b"ip is None"
        if ip=='':
            return b'ip is empty'
        pcArg=['ping','-c','9',ip]
        proc = Popen(pcArg,stdout=PIPE)
        out = proc.stdout.readlines()
        res = b""
        for row in out:
            res+=row
        proc.stdout.close()
        return res.decode()


if __name__ == '__main__':
    # Next, create an application object.
    QApplication.setDesktopSettingsAware(False)
    app = QApplication(sys.argv)
    # Show it.
    frame = MainWindow()
    # Start the event loop.
    sys.exit(app.exec_())