Встраивание стороннего приложения в python GUI ошибка

import sys
import subprocess
import threading
import time
import win32gui
from PyQt5.QtCore    import Qt
from PyQt5.QtGui     import QWindow, QPixmap
from PyQt5.QtWidgets import (QWidget, QApplication, QVBoxLayout,
                             QGridLayout, QMainWindow, QLabel) 


class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.central_widget = QWidget()
        self.setCentralWidget(self.central_widget)
        
        self.widget = QWidget()
        self.widget.setFixedSize(230, 280)
        self.widget.setStyleSheet("background-color: yellow;")
        self.label = QLabel(self)
        self.label.setPixmap(
            QPixmap('images/splash_.jpg').scaled(self.size().width()/2, self.size().height())
        )
        
        self.grid_layout = QGridLayout(self.central_widget)
        self.grid_layout.addWidget(self.widget, 0, 0, 2, 1)
        
        self.v_layout = QVBoxLayout(self.widget)
        self.initUI()
        self.grid_layout.addWidget(self.label, 0, 1, 1, 1) 
 
    def initUI(self):
        t = threading.Thread(target=self.runExe)
        t.start()
 
        hwnd1 = win32gui.FindWindowEx(0, 0, "CalcFrame", "Калькулятор")
        start = time.time()
        while hwnd1 == 0:
            time.sleep(0.01)
            hwnd1 = win32gui.FindWindowEx(0, 0, "CalcFrame", "Калькулятор")
            end = time.time()
            if end - start > 5:
                return
        window = QWindow.fromWinId(hwnd1)
        widget = self.createWindowContainer(window, self.central_widget)
        self.v_layout.addWidget(widget)
 
    @staticmethod
    def runExe():
        exePath = "C:/Windows/system32/calc.exe"
        subprocess.Popen(exePath)

 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    ex.resize(550, 400)
    ex.show()
    sys.exit(app.exec_())