What’s new in h5py 3.13

New features

• New File.in_memory() constructor to conveniently build an HDF5 file structure in memory (PR 2517).

• Dataset views returned by astype(), asstr() and fields() have gained the .dtype, .ndim, .shape, and .size attributes (PR 2550).

• The bundled HDF5 library in the pre-built packages was updated to 1.14.6 (PR 2554).

• Opening an existing dataset in a file is faster since it now only loads the “dataset creation property list” when required (PR 2552).

Exposing HDF5 functions

• H5Sselect_shape_same exposed as h5py.h5s.SpaceID.select_shape_same() (PR 2529).

Bug fixes

• Fix various bugs when applying np.array or np.asarray to a Dataset view returned by astype(), asstr(), or fields().

Building h5py

• Fixed building h5py with Numpy 2.3 (PR 2556).

• Bump the specified mpi4py version to fix building with MPI support on Python 3.13 (PR 2524).

• Fix for running api_gen.py directly (PR 2534).