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        >>> pb
        <ProgressBar flow widget>
        >>> print(pb.get_text())
        0 %
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        >>> print(pb.get_text())
        34 %
        >>> class CustomProgressBar(ProgressBar):
        ...     def get_text(self):
        ...         return u'Foobar'
        >>> cpb = CustomProgressBar('a', 'b')
        >>> print(cpb.get_text())
        Foobar
        >>> for x in range(101):
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