macheap.py 文件源码

def _walk(self, direction):
        '''Yield all the elements in the specified direction.'''
        yield self
        res = direction(self)
        while res.int():
            res = res.d
            res = reduce(operator.__getitem__, self._path_, res.l)
            yield res
            res = direction(res)
        return

    # FIXME: make sure that these return each and every header