qt - QProgressBar on QStatusBar : how to remove the 2 little vertical lines on either side of the QprogressBar? -

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i add qprogressbar following qlabel qstatusbar following code ,but qprogressbar lined 2 little vertical lines . wonder how remove 2 vertical lines ?

import sys pyqt4.qtgui import * pyqt4.qtcore import *  class mainwindow(qmainwindow):      def __init__(self, parent=none):         super(mainwindow, self).__init__(parent)         self.resize(800, 600)          self.lb=qlabel('finding resource   ')          self.pb = qprogressbar()         self.pb.setrange(0, 0) #        self.pb.settextvisible(false)          self.statusbar().addpermanentwidget(self.lb)         self.statusbar().addpermanentwidget(self.pb, 1)  if __name__ == "__main__":     app = qapplication(sys.argv)      ui = mainwindow()     ui.show() sys.exit(app.exec_())


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