app.py

from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtWidgets import QApplication
import OTPListModel

qapp = QApplication()
app = QQmlApplicationEngine()
model = OTPListModel.OPTListModel()
model.load()
app.rootContext().setContextProperty("otpListModel", model)
app.load("qml/main.qml")
qapp.exec_()