import h5py
for iteration in range(100):
    with h5py.File('results.h5','a') as f:
        path = '/state/iteration%d' % iteration
        state = get_state(iteration)
        f.create_dataset(path, data=state)

import h5py
for iteration in range(100):
    file_path = 'results_iteration%d.h5'  % iteration
    path = '/state/iteration%d' % iteration
    state = get_state(iteration)
    with h5py.File(file_path,'w') as f:
        f.create_dataset(path, data=state)