[PyQt] Problem with class inheriting QDialog

[dizou]

I have a class Dialog inheriting a QDialog:

def Dialog(QDialog):
	def __init__(self, parent):
		QDialog.__init__(self, parent)

I have a MainWindow class that inherits QMainWindow that creates the Dialog
class:

class MainWindow(QMainWindow):
    def __init__(self):
        #stuff
    def MyFunction():
        dialog = Dialog(self)
        print type(dialog)
        dialog.exec_()

When MyFunction is called I get this output and error:

<type 'NoneType'>
...
AttributeError: 'NoneType' object has no attribute 'exec_'

I guess the QDialog isn't being initialized right? How do I fix this?
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