import h5py

f = h5py.File('./data/..../test.h5', 'w')

x = np.array([[][], [][]])

dt = h5py.special_dtype(vlen=str)
d1 = f.create_dataset('d1', shape=x.shape, dtype=dt)
d1[:] = x

f['test'].attrs['names'] = ['content', 'label']


f = h5py.File('x......h5')
test = f['test'][:]
names = f['test'].attrs['names']