3-BoxLayout.py

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
from PyQt4 import QtGui


class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    
    def initUI(self):
        
        okButton = QtGui.QPushButton('OK')
        cancelButton = QtGui.QPushButton('Cancel')
        
        hbox = QtGui.QHBoxLayout()
        hbox.addStretch(2)
        hbox.addWidget(okButton)
        hbox.addWidget(cancelButton)

        vbox = QtGui.QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setLayout(vbox)

        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')
        self.show()


def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()