<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def keyPressEvent(self, event):

 """Reimplement Qt method to allow cyclic behavior."""

        if event.key() == Qt.Key_Down:
            self.select_row(1)
        elif event.key() == Qt.Key_Up:
            self.select_row(-1)