the PySide code here prompts "TypeError: 'str' object is not callable" while it 
is working,but  ‍When changed to PyQt code, it works well.‍


The reason why this happen is because you cannot ‍self.text = None in PySide,‍


It seems naming-clash error happened in PySide while not in PyQt , so Which 
used a rather good tool to wrap Qt for Python , PySide or PyQt ? ‍




from PySide import QtGui, QtCore




class MyProgressBar(QtGui.QProgressBar):


    def __init__(self):
        super().__init__()
        self.setRange(0, 0)
        self.setAlignment(QtCore.Qt.AlignCenter)
        self.text = None


    # def setText(self, text):
    #     self.text = text


    # def text(self):
    #     return self.text


app = QtGui.QApplication([])


p = MyProgressBar()
# p.setText('finding resource...')
p.show()


app.exec_()‍
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