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    <p>First, don't use:</p> <pre><code>from PyQt4.QtCore import * from PyQt4.QtGui import * </code></pre> <p>Instead:</p> <pre><code>from PyQt4 import QtCore, QtGui </code></pre> <p>And reference the modules explicitly.</p> <pre><code>class DlgAbout(QtGui.QDialog, Ui_DlgAbout): </code></pre> <p>etc.</p> <p>In your code, all you've done is defined a dialog box. You haven't defined any main application to run, or any way to show the dialog box.</p> <p>For an example, here's a basic main <em>application</em> to run:</p> <pre><code>from PyQt4 import QtGui import sys class MyMainWindow(QtGui.QMainWindow): def __init__(self, parent=None): super(MyMainWindow, self).__init__(parent) self.form_widget = FormWidget(self) self.setCentralWidget(self.form_widget) class FormWidget(QtGui.QWidget): def __init__(self, parent): super(FormWidget, self).__init__(parent) self.layout = QtGui.QVBoxLayout(self) self.button = QtGui.QPushButton("Button!") self.layout.addWidget(self.button) if __name__ == "__main__": app = QtGui.QApplication([]) foo = MyMainWindow() foo.show() sys.exit(app.exec_()) </code></pre> <p>This defines a main window, and a form (Which MyMainWindow sets up, as you can see). I then check if this is the main file being run (<code>if __name__ == "__main__":</code>), and I start the application (The <code>app = QtGui.QApplication([])</code>, create the main window, and <strong>show the main window</strong>.</p> <p>In your case, you could define a main application like I did, and make it alert your QDialog.</p>
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    1. COthanx a lot :):)
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    2. COwhen i declare QDialog.__init__(self,parent) in class FormWidget(QtGui.QWidget): ,it gives error saying NameError: global name 'QDialog' is not defined...... help me out...
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    3. COTry `QtGui.QDialog`. You'll also need to change the pixmap to `QtGui.QPixmap`. That's what I meant about referencing the modules explicitly ;)
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