self.connect(quit, QtCore.SIGNAL('clicked()'), qApp,QtCore.SLOTNameError: name 'qApp' is not defined

python pyqt4 出现如下错误 Traceback (most recent call last):   File "C:/shibie/pyQtexample.py", line 32, in <module>     qb=QuitButton()   File "C:/shibie/pyQtexample.py", line 28, in __init__     self.conn
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