[PyQt] How is thousands separator displayed in QDoubleSpinBox?

[bluekyu]

Hello, I want to display thousands separator in QDoubleSpinBox.
(For example, I may click upward button at 999 and it dispaly 1,000)
I tried to find this in google and doc.
But I don't know how to do this. Can I do this?

My environment is python3.1, pyqt 4.7.3, kubuntu 10.04 and
QWidget.locale().groupSeparator() is ','
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