Getting active widget (dialog, message)

import sys
from PySide.QtGui import *
from PySide.QtCore import *


class MainGui(QWidget):

    def __init__(self, parent=None):
        super(MainGui, self).__init__(parent)
        grid = QVBoxLayout(self)
        self.button_msg = QPushButton("Show message", self)
        self.button_msg.clicked.connect(self.show_message)
        self.button_dialog = QPushButton("Show dialog", self)
        self.button_dialog.clicked.connect(self.show_dialog)
        grid.addWidget(self.button_msg)
        grid.addWidget(self.button_dialog)

    def show_message(self):
        QTimer.singleShot(10, self.print_acitve_widget)
        QMessageBox.about(self, "Test message", 'Test message')

    def show_dialog(self):
        QTimer.singleShot(10, self.print_acitve_widget)
        d = QInputDialog(self)
        d.exec_()

    def print_acitve_widget(self):
        print 'Active window:', QApplication.activeWindow()
        print 'Active modal widget:', QApplication.activeModalWidget()



def main():
    app = QApplication(sys.argv)
    ex = MainGui()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()