Select entire extent of data space
H5S.select_all(space_id)
H5S.select_all(space_id) selects the entire
extent of the data space specified by space_id.
fid = H5F.open('example.h5'); dset_id = H5D.open(fid,'/g3/integer'); space_id = H5D.get_space(dset_id); num_points1 = H5S.get_select_npoints(space_id); H5S.select_none(space_id); num_points2 = H5S.get_select_npoints(space_id); H5S.select_all(space_id); num_points3 = H5S.get_select_npoints(space_id);