PyTables is really useful, but there is also h5py. I sometimes find it handy to create an HDF data structure in memory, and I think the latter library has bette

PyTables is really useful, but there is also h5py. I sometimes find it handy to create an HDF data structure in memory, and I think the latter library has better support in that case. I would like to know more about HDF read and write performance though, maybe relative to protobuf and msgpack (both could be much faster, but I wonder).