Kamerazähler PyQt5

from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import PyQt5
import sys
import os
from PyQt5.QtMultimedia import QCameraInfo

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

    def Kamerazaehlen(self):
        online_webcams = QCameraInfo.availableCameras()
        print(online_webcams)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setApplicationName("Webcam")
    windwow = MainWindow()
    app.exec_()