environment/lib/python2.7/site-packages/IPython/frontend/qt/console/completion_html.py
def select_down(self):
        """move cursor down"""
        r, c = self._index
        self._select_index(r+1, c)
def select_down(self):
        r, c = self._index
        self._select_index(r+1, c)
def select_down ( self ) : r , c = self . _index self . _select_index ( r + 1 , c )
move cursor down
move cursor down