import sys

from PySide2.QtCore import QTimeLine,qVersion, QSysInfo
from PySide2.QtWidgets import QWidget, QApplication, QLabel, QHBoxLayout

class TestWidget(QWidget):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.layout = QHBoxLayout()
        l = qVersion() + ' ' + qApp.platformName() + ' ' + QSysInfo.prettyProductName()
        print(l)
        self.label = QLabel(l)
        self.layout.addWidget(self.label)
        self.setLayout(self.layout)

        self.setWindowTitle('Modifier key test')
        self.show()
        self.counter = 0
        self.timeline = QTimeLine(duration = 1000)
        self.timeline.setFrameRange(0, 20)
        self.timeline.setLoopCount(0)
        self.timeline.frameChanged.connect(self.tick)
        self.timeline.start()
        return

    def tick(self, frame: int):
        modifiers = int(QApplication.keyboardModifiers())
        queriedModifiers = int(QApplication.queryKeyboardModifiers())
        print("[{}] Tick frame {}! Modifiers: {} / {}".format(self.counter, frame, modifiers, queriedModifiers))
        self.counter += 1
        return


def main():
    app = QApplication([])
    twidg = TestWidget()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()