How to extend h5py so that I can access data within a hdf5 file?

H5py gives you a direct interface for reading/writing and manipulating data stored in an hdf5 file. Have you looked at the docs?

If you don't actually need a particular structure of HDF5, but you just need the speed and cross-platform compatibility, I'd recommend taking a look at PyTables. It has the built-in ability to read and write Numpy arrays.

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