def next(self, header, same_or_high=False):
        """
        given a header returns the closer header
        (down direction)
        """
        index, headers = self._index(header, same_or_high)
        try:
            return headers[index + 1]
        except __HOLE__:
            return None
dataset/ETHPy150Open mgaitan/sublime-rst-completion/headers.py/RstHeaderTree.next