PyQt4 How keep a QWidget always on top?

Question

I'm using PyQt4 with python 2.7 on Windows7

I have a QWidget that I want to stay above the QMainWindow while clicking on the main. The idea is that the main will contain a series of 'edit' buttons that will open the edit widget, while the edit widget refreshes with info contained on the main. I don't particularly care if either is "always on top" as long as the widget stays in front of the main window.

There are a couple of questions that address this topic, but I'm not seeing an answer that works for my specific use case. One deals in widgets but provides an answer only for the app main window (widget stays above other environmental windows but falls behind the application main window when clicking on the main), and the other addresses Qt generally but not a pythonic example:

PyQt: Always on top

How keep a QWidget always on top?

Here is the code I have so far:

from PyQt4 import QtCore, QtGui

class Ui_MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self, None, QtCore.Qt.WindowStaysOnTopHint)
        self.setWindowTitle("MainWindow")
        self.resize(400, 300)

class Ui_Widget(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self, None, QtCore.Qt.WindowStaysOnTopHint)
        self.setWindowTitle("Widget")
        self.resize(400, 300)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = Ui_MainWindow()
    MainWindow.show()
    Widget = Ui_Widget()
    Widget.show()
    sys.exit(app.exec_())

Answer 1

If you want Ui_Widget to always be on top of Ui_MainWindow, Ui_Widget must be a child of Ui_MainWindow and the flag Qt::Dialog must be activated as shown below:

from PyQt4 import QtCore, QtGui

class Ui_MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.setWindowTitle("MainWindow")
        self.resize(400, 300)

class Ui_Widget(QtGui.QWidget):
    def __init__(self,  parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.Dialog)
        self.setWindowTitle("Widget")
        self.resize(400, 300)
        self.move(200, 150)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = Ui_MainWindow()
    MainWindow.show()
    Widget = Ui_Widget(MainWindow)
    Widget.show()
    sys.exit(app.exec_())