Port a console app example to PySide2 from the theme: https://stackoverflow.com/questions/10641055

Main.py

from PySide2 import QtCore

class Console(QtCore.QObject):

    def __init__(self, msg):
        super(Console, self).__init__()
        self.msg = msg
        self.timer = QtCore.QBasicTimer()
        self.timer.start(500, self)
        self.i = 0

    def timerEvent(self, event):
        print(self.msg)
        self.i += 1
        if self.i > 5:
            QtCore.QCoreApplication.instance().quit()

if __name__ == "__main__":
    import sys
    app = QtCore.QCoreApplication(sys.argv)
    console = Console("Hello, World!")
    sys.exit(app.exec_())