import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtWidgets import QLabel


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()

        helloLabel = QLabel(self)
        helloLabel.setText('Működik')
        helloLabel.move(120, 90)        

        self.setGeometry(100,100,320,200)
        self.setWindowTitle('Helló Világ')
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    sys.exit(app.exec_())