File: bytesio.py

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h5py 3.15.1-4
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"""Create an HDF5 file in memory and retrieve the raw bytes

This could be used, for instance, in a server producing small HDF5
files on demand.
"""
import io
import h5py

bio = io.BytesIO()
with h5py.File(bio, 'w') as f:
    f['dataset'] = range(10)

data = bio.getvalue() # data is a regular Python bytes object.
print("Total size:", len(data))
print("First bytes:", data[:10])