Python QDialog Example

import sys, os
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import Qt

class Dialog(QtGui.QDialog):
    def __init__(self, parent = None):
        super(Dialog, self).__init__(parent)
        # widgets
        self.edit1 = QtGui.QLineEdit()
        self.edit2 = QtGui.QLineEdit()
        self.btnOk = QtGui.QPushButton("Ok")
        self.btnCancel = QtGui.QPushButton("Cancel")
        self.btnHelp = QtGui.QPushButton("Help")
        self.btnOk.setDefault(True)

        # layout
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.edit1)
        layout.addWidget(self.edit2)
        layout.addWidget(self.btnHelp)
        layout.addWidget(self.btnOk)
        layout.addWidget(self.btnCancel)
        self.setLayout(layout)

        # signals
        self.btnOk.clicked.connect(self.accept)
        self.btnCancel.clicked.connect(self.reject)
        self.btnHelp.clicked.connect(self.help)

    def help(self):
        print("HELP...")

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog = Dialog()
    result = dialog.exec_()
    print(result)
    sys.exit(0)