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我通过以下代码将 QLabel 之后的 QProgressBar 添加到 QStatusBar,但 QProgressBar 内衬有 2 条小垂直线。我想知道如何删除2条垂直线?

import sys
from PyQt4.QtGui import *
from 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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