#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PySide.QtGui import (QMainWindow, QWidget, QApplication, QVBoxLayout, QTextEdit,
        QPushButton, QDesktopServices)
from PySide.QtCore import QObject, SIGNAL
import sys


class MyMainWindow(QMainWindow):
    """ main """
    def __init__(self, MainWindow, *args, **kwargs):
        super(type(self), self).__init__(*args, **kwargs)

        MainWindow.setWindowTitle("Window")
        MainWindow.resize(450, 500)
        MainWindow.show()

        self.initui()

    def initui(self):
        self.centralwidget = QWidget()
        self.vlbox_1 = QVBoxLayout(self.centralwidget)
        self.vlbox_2 = QVBoxLayout()

        self.widgets1()

    def widgets1(self):
        self.textEdit = QTextEdit(self.centralwidget)
        self.vlbox_2.addWidget(self.textEdit)

        self.btn_help = QPushButton("Help", self.centralwidget)
        self.vlbox_2.addWidget(self.btn_help)

        self.vlbox_1.addLayout(self.vlbox_2)
        MainWindow.setCentralWidget(self.centralwidget)

        self.access()

    def access(self):
        QObject.connect(self.btn_help, SIGNAL("clicked()"), self.helpurl)

    def helpurl(self):
        QDesktopServices.openUrl("http://www.pyside.org/docs/pyside/PySide/QtGui/QTextEdit.html#pyside-qtgui-qtextedit-editing-key-bindings")


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