#!/usr/bin/python
# -*- coding: utf-8 -*-
import sys
from PySide import QtGui


def new_window():
    global wid2
    wid2 = QtGui.QWidget()
    wid2.resize(250, 150)
    wid2.setWindowTitle(u'Drugie okno')
    wid2.show()

app = QtGui.QApplication(sys.argv)

wid = QtGui.QWidget()
wid.resize(250, 150)
wid.setWindowTitle('Simple')
wid.show()


button = QtGui.QPushButton(u'Nowe okno')
button.clicked.connect(new_window)

layout = QtGui.QVBoxLayout(wid)
layout.addWidget(button)

sys.exit(app.exec_())