nctoolkit: A Python package for netCDF analysis and post-processing

This is a major release with breaking changes.

A critical change is that accessing dataset attributes will force evaluation, i.e. ds.run() will occur if you access an attribute such as ds.times. This makes behaviour more consistent with what new users would expect.

This should not have a major impact on any coding workflows.

The cdo_command method has been changed so that it no longer checks the validity of the command before calling CDO. Checks can now be run using the check argument.

Some improvements have been made to method internals for pub_plot.