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    <p>Firstly you are using PySide(Nokia) not PyQt4(Riverbank Computing), although their API's are nearly identical they are not the same project. The PySide examples are available here: git clone git://gitorious.org/pyside/pyside-examples.git</p> <p>I think the problem may have to do with your call of </p> <pre><code>super(MyMainWindow, self).__init__(parent) </code></pre> <p>try</p> <pre><code>QtGui.QMainWindow.__init__(self, parent) </code></pre> <p>instead.</p> <p>I know it seems like it is the same thing, but I've ran into similar problems with super using PyQt4, and from what I can tell Nokia's PySide has the same troubles. It has something to do with weather the Python owns the parent or it's owned by an underlying C++ object. At least give it a try, it'll take less than 5 seconds!</p> <p>Below is the example I'm basing this off of, it's from the git repo for PySide.</p> <pre><code>#!/usr/bin/env python ############################################################################# ## ## Copyright (C) 2004-2005 Trolltech AS. All rights reserved. ## ## This file is part of the example classes of the Qt Toolkit. ## ## This file may be used under the terms of the GNU General Public ## License version 2.0 as published by the Free Software Foundation ## and appearing in the file LICENSE.GPL included in the packaging of ## this file. Please review the following information to ensure GNU ## General Public Licensing requirements will be met: ## http://www.trolltech.com/products/qt/opensource.html ## ## If you are unsure which license is appropriate for your use, please ## review the following information: ## http://www.trolltech.com/products/qt/licensing.html or contact the ## sales department at sales@trolltech.com. ## ## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ## ############################################################################# import sys from PySide import QtCore, QtGui from ui_calculatorform import Ui_CalculatorForm class CalculatorForm(QtGui.QWidget): def __init__(self, parent=None): QtGui.QWidget.__init__(self, parent) self.ui = Ui_CalculatorForm() self.ui.setupUi(self) @QtCore.pyqtSignature("int") def on_inputSpinBox1_valueChanged(self, value): self.ui.outputWidget.setText(QtCore.QString.number(value + self.ui.inputSpinBox2.value())) @QtCore.pyqtSignature("int") def on_inputSpinBox2_valueChanged(self, value): self.ui.outputWidget.setText(QtCore.QString.number(value + self.ui.inputSpinBox1.value())) if __name__ == "__main__": app = QtGui.QApplication(sys.argv) calculator = CalculatorForm() calculator.show() sys.exit(app.exec_()) </code></pre>
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