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226 changes: 12 additions & 214 deletions docs/src/whatsnew/latest.rst
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Expand Up @@ -16,7 +16,7 @@ This document explains the changes made to Iris for this release

The highlights for this minor release of Iris include:

* We've dropped support for `Python 3.6`_
* N/A

And finally, get in touch with us on `GitHub`_ if you have any issues or
feature requests for improving Iris. Enjoy!
Expand All @@ -25,95 +25,30 @@ This document explains the changes made to Iris for this release
📢 Announcements
================

#. Congratulations to `@jamesp`_ who recently became an Iris core developer
after joining the Iris development team at the `Met Office`_. 🎉

#. A special thanks goes to `@akuhnregnier`_, `@gcaria`_, `@jamesp`_, `@MHBalsmeier`_
and `@Badboy-16`_ all of whom made their first contributions to Iris, which
were gratefully received and included in this release. Keep up the awesome
work! 🍻
#. N/A


✨ Features
===========

#. `@pelson`_ and `@trexfeathers`_ enhanced :meth:`iris.plot.plot` and
:meth:`iris.quickplot.plot` to automatically place the cube on the x axis if
the primary coordinate being plotted against is a vertical coordinate. E.g.
``iris.plot.plot(z_cube)`` will produce a z-vs-phenomenon plot, where before
it would have produced a phenomenon-vs-z plot. (:pull:`3906`)
#. `@jonseddon`_ added :meth:`iris.plot.barbs` to provide a convenient way to
use :func:`matplotlib.pyplot.barbs` with Iris cubes. A gallery example was
included to illustrate the new method's use. (:pull:`3710`)

#. `@bjlittle`_ introduced :func:`iris.common.metadata.hexdigest` to the
public API. Previously it was a private function introduced in ``v3.0.0``.
Given any object, :func:`~iris.common.metadata.hexdigest` returns a string
representation of the 64-bit non-cryptographic hash of the object using the
extremely fast `xxhash`_ hashing algorithm. (:pull:`4020`)

#. `@rcomer`_ implemented a ``__str__`` method for metadata classes, so
printing these objects skips metadata elements that are set to None or an
empty string or dictionary. (:pull:`4040`)

#. `@Badboy-16`_ implemented a ``CubeList.copy()`` method to return a
``CubeList`` object instead of a ``list``. (:pull:`4094`)

#. `@pp-mo`_ and `@trexfeathers`_ reformatted :meth:`iris.cube.Cube.summary`,
(which is used for ``print(Cube)``); putting
:attr:`~iris.cube.Cube.cell_methods` before
:attr:`~iris.cube.Cube.attributes`, and improving spacing throughout.
(:pull:`4206`)

#. `@schlunma`_ added support for loading atmosphere sigma coordinates from netcdf-CF files. These now load as
:class:`iris.aux_factory.AtmosphereSigmaFactory` derived coordinates. (:pull: `4052`)
#. N/A


🐛 Bugs Fixed
=============

#. `@gcaria`_ fixed :class:`~iris.coords.Cell` comparison with
0-dimensional arrays and 1-dimensional arrays with len=1. (:pull:`4083`)

#. `@gcaria`_ fixed :meth:`~iris.cube.Cube.cell_measure_dims` to also accept the
string name of a :class:`~iris.coords.CellMeasure`. (:pull:`3931`)

#. `@gcaria`_ fixed :meth:`~iris.cube.Cube.ancillary_variable_dims` to also accept
the string name of a :class:`~iris.coords.AncillaryVariable`. (:pull:`3931`)
#. N/A

#. `@rcomer`_ modified :func:`~iris.plot.contourf` to skip the special handling for
antialiasing when data values are too low for it to have an effect. This caused
unexpected artifacts in some edge cases, as shown at :issue:`4086`. (:pull:`4150`)

#. `@MHBalsmeier`_ modified :func:`~iris.plot.contourf` to generalize :pull:`4150`
for the cases where NaN values occur in the plot array (:pull:`4263`)
💣 Incompatible Changes
=======================

#. `@trexfeathers`_ fixed the "anomaly_log_colouring" gallery example to be compatible with the latest Matplotlib usage
(:pull:`4115`)
#. N/A


🚀 Performance Enhancements
===========================

#. `@bjlittle`_ added support for automated ``import`` linting with `isort`_, which
also includes significant speed-ups for Iris imports. (:pull:`4174`)

#. `@bjlittle`_ Optimised the creation of dynamic metadata manager classes within the
:func:`~iris.common.metadata.metadata_manager_factory`, resulting in a significant
speed-up in the creation of Iris :class:`~iris.coords.AncillaryVariable`,
:class:`~iris.coords.AuxCoord`, :class:`~iris.coords.CellMeasure`, and
:class:`~iris.cube.Cube` instances. (:pull:`4227`)

#. `@pp-mo`_ and `@lbdreyer`_ optimised loading netcdf files, resulting in a
speed up when loading with a single :func:`~iris.NameConstraint`. Note, this
optimisation only applies when matching on standard name, long name or
NetCDF variable name, not when matching on STASH.
(:pull:`4176`)


💣 Incompatible Changes
=======================

#. N/A


Expand All @@ -126,166 +61,29 @@ This document explains the changes made to Iris for this release
🔗 Dependencies
===============

#. `@bjlittle`_ dropped both `black`_ and `flake8`_ package dependencies
from our `conda`_ YAML and ``setup.cfg`` PyPI requirements. (:pull:`4181`)

#. `@pp-mo`_ removed dependency on `PyKE_`. (:pull: `4198`)
#. N/A


📚 Documentation
================

#. `@rcomer`_ updated the "Seasonal ensemble model plots" and "Global average
annual temperature maps" Gallery examples. (:pull:`3933` and :pull:`3934`)

#. `@MHBalsmeier`_ described non-conda installation on Debian-based distros.
(:pull:`3958`)

#. `@bjlittle`_ clarified in the doc-string that :class:`~iris.coords.Coord`
is now an `abstract base class`_ since Iris ``3.0.0``, and it is **not**
possible to create an instance of it. (:pull:`3971`)

#. `@bjlittle`_ added automated Iris version discovery for the ``latest.rst``
in the ``whatsnew`` documentation. (:pull:`3981`)

#. `@tkknight`_ stated the Python version used to build the documentation
on :ref:`installing_iris` and to the footer of all pages. Also added the
copyright years to the footer. (:pull:`3989`)

#. `@bjlittle`_ updated the ``intersphinx_mapping`` and fixed documentation
to use ``stable`` URLs for `matplotlib`_. (:pull:`4003`)

#. `@bjlittle`_ added the |PyPI|_ badge to the `README.md`_. (:pull:`4004`)

#. `@tkknight`_ added a banner at the top of every page of the unreleased
development documentation if being viewed on `Read the Docs`_.
(:pull:`3999`)

#. `@bjlittle`_ added post-release instructions on how to :ref:`update_pypi`
with `scitools-iris`_. (:pull:`4038`)

#. `@bjlittle`_ added the |pre-commit.ci|_ badge to the `README.md`_.
See :ref:`pre_commit_ci` for further details. (:pull:`4061`)

#. `@rcomer`_ tweaked docstring layouts in the :mod:`iris.plot` module, so
they render better in the published documentation. See :issue:`4085`.
(:pull:`4100`)

#. `@tkknight`_ documented the ``--force`` command line option when creating
a conda development environment. See :ref:`installing_from_source`.
(:pull:`4240`)

#. `@MHBalsmeier`_ updated and simplified non-conda installation on Debian-based distros.
(:pull:`4260`)
#. N/A


💼 Internal
===========

#. `@rcomer`_ removed an old unused test file. (:pull:`3913`)

#. `@tkknight`_ moved the ``docs/iris`` directory to be in the parent
directory ``docs``. (:pull:`3975`)

#. `@jamesp`_ updated a test for `numpy`_ ``1.20.0``. (:pull:`3977`)

#. `@bjlittle`_ and `@jamesp`_ extended the `cirrus-ci`_ testing and `nox`_
testing automation to support `Python 3.8`_. (:pull:`3976`)

#. `@bjlittle`_ rationalised the ``noxfile.py``, and added the ability for
each ``nox`` session to list its ``conda`` environment packages and
environment info. (:pull:`3990`)

#. `@bjlittle`_ enabled `cirrus-ci`_ compute credits for non-draft pull-requests
from collaborators targeting the Iris ``main`` branch. (:pull:`4007`)

#. `@akuhnregnier`_ replaced `deprecated numpy 1.20 aliases for builtin types`_.
(:pull:`3997`)

#. `@bjlittle`_ added conditional task execution to `.cirrus.yml`_ to allow
developers to easily disable `cirrus-ci`_ tasks. See
:ref:`skipping Cirrus-CI tasks`. (:pull:`4019`)

#. `@bjlittle`_ and `@jamesp`_ addressed a regression in behaviour when using
`conda`_ 4.10.0 within `cirrus-ci`_. (:pull:`4084`)

#. `@bjlittle`_ updated the perceptual imagehash graphical test support for
`matplotlib`_ 3.4.1. (:pull:`4087`)

#. `@jamesp`_ switched `cirrus-ci`_ testing and `nox`_
testing to use `conda-lock`_ files for static test environments. (:pull:`4108`)

#. `@bjlittle`_ updated the ``bug-report`` and ``feature-request`` GitHub issue
templates to remove an external URL reference that caused un-posted user issue
content to be lost in the browser when followed. (:pull:`4147`)

#. `@bjlittle`_ dropped `Python 3.6`_ support, and automated the discovery of
supported Python versions tested by `cirrus-ci`_ for documentation.
(:pull:`4163`)

#. `@bjlittle`_ refactored ``setup.py`` into ``setup.cfg``. (:pull:`4168`)

#. `@bjlittle`_ consolidated the ``.flake8`` configuration into ``setup.cfg``.
(:pull:`4200`)

#. `@bjlittle`_ renamed ``iris/master`` branch to ``iris/main`` and migrated
references of ``master`` to ``main`` within codebase. (:pull:`4202`)

#. `@bjlittle`_ added the `blacken-docs`_ ``pre-commit`` hook to automate
``black`` linting of documentation code blocks. (:pull:`4205`)

#. `@bjlittle`_ consolidated `nox`_ ``black``, ``flake8`` and ``isort`` sessions
into one ``lint`` session using ``pre-commit``. (:pull:`4181`)

#. `@bjlittle`_ streamlined the `cirrus-ci`_ testing by removing the ``minimal``
tests, which are a subset of the ``full`` tests. (:pull:`4218`)

#. `@bjlittle`_ consolidated the `cirrus-ci`_ documentation ``doctest`` and
``gallery`` tasks into a single task and associated `nox`_ session.
(:pull:`4219`)

#. `@jamesp`_ and `@trexfeathers`_ implemented a benchmarking CI check
using `asv`_. (:pull:`4253`)

#. `@pp-mo`_ and `@stephenworsley`_ refactored almost all of :meth:`iris.cube.Cube.summary` into the
new private module: :mod:`iris._representation`; rewritten with a more
modular approach, resulting in more readable and extensible code.
(:pull:`3987`) (:pull:`4206`)

#. `@pp-mo`_ reworked the netcdf loading code, replacing Pyke rules with a pure Python implementation.
(:pull: `4198`)

#. N/A

#. `@lbdreyer`_ updated the CF standard name table to the latest version:
`v77 <http://cfconventions.org/Data/cf-standard-names/77/src/cf-standard-name-table.xml>`_.
(:pull:`4282`)

.. comment
Whatsnew author names (@github name) in alphabetical order. Note that,
core dev names are automatically included by the common_links.inc:

.. _@akuhnregnier: https://github.com/akuhnregnier
.. _@Badboy-16: https://github.com/Badboy-16
.. _@gcaria: https://github.com/gcaria
.. _@MHBalsmeier: https://github.com/MHBalsmeier
.. _@schlunma: https://github.com/schlunma



.. comment
Whatsnew resources in alphabetical order:

.. _abstract base class: https://docs.python.org/3/library/abc.html
.. _blacken-docs: https://github.com/asottile/blacken-docs
.. _deprecated numpy 1.20 aliases for builtin types: https://numpy.org/doc/1.20/release/1.20.0-notes.html#using-the-aliases-of-builtin-types-like-np-int-is-deprecated
.. _GitHub: https://github.com/SciTools/iris/issues/new/choose
.. _Met Office: https://www.metoffice.gov.uk/
.. _numpy: https://numpy.org/doc/stable/release/1.20.0-notes.html
.. |pre-commit.ci| image:: https://results.pre-commit.ci/badge/github/SciTools/iris/main.svg
.. _pre-commit.ci: https://results.pre-commit.ci/latest/github/SciTools/iris/main
.. |PyPI| image:: https://img.shields.io/pypi/v/scitools-iris?color=orange&label=pypi%7Cscitools-iris
.. _PyPI: https://pypi.org/project/scitools-iris/
.. _Python 3.8: https://www.python.org/downloads/release/python-380/
.. _Python 3.6: https://www.python.org/downloads/release/python-360/
.. _README.md: https://github.com/SciTools/iris#-----
.. _xxhash: http://cyan4973.github.io/xxHash/
.. _conda-lock: https://github.com/conda-incubator/conda-lock
.. _asv: https://asv.readthedocs.io/en/stable/