from typing import Optional
from PySide6.QtCore import QCoreApplication, QObject, QStringListModel, Signal, QTimer
from PySide6.QtGui import QColor
import sys
import signal

class MyData(QObject):
    _color_names: QStringListModel = QStringListModel()

    _counter = 0
    color_names_changed = Signal(QObject)

    def __init__(self, parent: Optional[QObject] = None) -> None:
        super().__init__(parent)
        self._color_names.setStringList(QColor.colorNames())
        self._timer = QTimer(self)
        self._timer.timeout.connect(self.doEmit)
        self._timer.start(500)

    def doEmit(self):
        if self._counter == 5:
            QCoreApplication.instance().quit()

        self.color_names_changed.emit(QColor.colorNames())
        # Above was a mistake, should have been self.color_names_changed.emit(self._color_names)
        self._counter += 1

def main() -> int:
    signal.signal(signal.SIGINT, signal.SIG_DFL)
    app = QCoreApplication(sys.argv)

    myData = MyData()
    app.exec()
    return 0

if __name__ == "__main__":
    sys.exit(main())