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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def close(self):
 """Explicitly called destructor. Removes widget from the qpart """

        self._closeIfNotUpdatedTimer.stop()
        self._qpart.removeEventFilter(self)
        self._qpart.cursorPositionChanged.disconnect(self._onCursorPositionChanged)

        QListView.close(self)