import sys
from PyQt5.QtWidgets import QApplication, QMainWindow

class MainWindow(QMainWindow):

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

        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_())