What’s new in h5py 3.10

New features

h5py now has pre-built packages for Python 3.12.
Pre-built packages on Linux & Windows now bundle HDF5 version 1.14.2. Mac packages still contain HDF5 1.12.2 for now. You can still build h5py from source against a wider range of HDF5 versions.
The read-only S3 file driver (‘ros3’) now accepts an AWS session token as part of the credentials (PR 2301). Pass session_token when opening a File (along with the other S3 parameters). This requires HDF5 1.14.2 or later, with the ROS3 feature built.

Support for the HDF5 1.8 series was dropped, along with early 1.10 releases. The minimum required HDF5 version is now 1.10.4.

Various nasty bugs when using nested compound and vlen data types have been fixed (PR 2134).
Fixed an OverflowError in some cases when registering a filter with h5z.register_filter(), especially on 32-bit architectures (PR 2318).
Sequential slicing/indexing operations on a VirtualSource object (e.g. source[:10][::2]) now raise an error, rather than giving incorrect results (PR 2280).

h5py now uses HDF5’s 1.10 compatibility mode at compile time rather than the 1.8 compatibility mode (PR 2320). This is normally transparent even if you’re building h5py from source.