#!/usr/bin/env python


import sys

import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)

from PyQt4.QtGui import (QWidget, QApplication, QMainWindow)


class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.widget = QWidget()
        self.setCentralWidget(self.widget)

def main():
    app = QApplication(sys.argv)
    form = MainWindow()
    form.show()
    app.exec_()


main()