What's new in h5py 3.6 ====================== New features ------------ * Pre-built packages are now available for Python 3.10. Deprecations ------------ * Using :meth:`.Dataset.astype` as a context manager (``with dset.astype(t):``) is deprecated. Slice the object returned by astype instead (``data = dset.astype(t)[:10]``). This works from h5py 3.0 onwards. * Getting the value of ``h5py.get_config().default_file_mode`` now issues a deprecation warning. This has been ``'r'`` by default from h5py 3.0, and cannot be changed since 3.3. Building h5py ------------- * h5py now requires the ``oldest-supported-numpy`` package at build time, instead of maintaining its own list of the oldest supported NumPy versions. The effect should be similar, but hopefully more reliable. Development ----------- * The custom ``setup.py test`` has been removed. `tox `_ should be used instead during development (see :ref:`contrib-run-tests`), and ``pytest --pyargs h5py`` can be used to test h5py after installation.