.. currentmodule:: xarray

What's New
==========

.. ipython:: python
    :suppress:

    import numpy as np
    import pandas as pd
    import xarray as xray
    import xarray
    import xarray as xr

    np.random.seed(123456)


.. _whats-new.0.16.2:

v0.16.2 (30 Nov 2020)
---------------------

This release brings the ability to write to limited regions of ``zarr`` files, open zarr files with :py:func:`open_dataset` and :py:func:`open_mfdataset`, increased support for propagating ``attrs`` using the ``keep_attrs`` flag, as well as numerous bugfixes and documentation improvements.

Many thanks to the 31 contributors who contributed to this release:
Aaron Spring, Akio Taniguchi, Aleksandar Jelenak, alexamici, Alexandre Poux, Anderson Banihirwe, Andrew Pauling, Ashwin Vishnu, aurghs, Brian Ward, Caleb, crusaderky, Dan Nowacki, darikg, David Brochart, David Huard, Deepak Cherian, Dion Häfner, Gerardo Rivera, Gerrit Holl, Illviljan, inakleinbottle, Jacob Tomlinson, James A. Bednar, jenssss, Joe Hamman, johnomotani, Joris Van den Bossche, Julia Kent, Julius Busecke, Kai Mühlbauer, keewis, Keisuke Fujii, Kyle Cranmer, Luke Volpatti, Mathias Hauser, Maximilian Roos, Michaël Defferrard, Michal Baumgartner, Nick R. Papior, Pascal Bourgault, Peter Hausamann, PGijsbers, Ray Bell, Romain Martinez, rpgoldman, Russell Manser, Sahid Velji, Samnan Rahee, Sander, Spencer Clark, Stephan Hoyer, Thomas Zilio, Tobias Kölling, Tom Augspurger, Wei Ji, Yash Saboo, Zeb Nicholls,

Deprecations
~~~~~~~~~~~~

- :py:attr:`~core.accessor_dt.DatetimeAccessor.weekofyear` and :py:attr:`~core.accessor_dt.DatetimeAccessor.week`
  have been deprecated. Use ``DataArray.dt.isocalendar().week``
  instead (:pull:`4534`). By `Mathias Hauser <https://github.com/mathause>`_,
  `Maximilian Roos <https://github.com/max-sixty>`_, and `Spencer Clark <https://github.com/spencerkclark>`_.
- :py:attr:`DataArray.rolling` and :py:attr:`Dataset.rolling` no longer support passing ``keep_attrs``
  via its constructor. Pass ``keep_attrs`` via the applied function, i.e. use
  ``ds.rolling(...).mean(keep_attrs=False)`` instead of ``ds.rolling(..., keep_attrs=False).mean()``
  Rolling operations now keep their attributes per default (:pull:`4510`).
  By `Mathias Hauser <https://github.com/mathause>`_.

New Features
~~~~~~~~~~~~

- :py:func:`open_dataset` and :py:func:`open_mfdataset`
  now works with ``engine="zarr"`` (:issue:`3668`, :pull:`4003`, :pull:`4187`).
  By `Miguel Jimenez <https://github.com/Mikejmnez>`_ and `Wei Ji Leong <https://github.com/weiji14>`_.
- Unary & binary operations follow the ``keep_attrs`` flag (:issue:`3490`, :issue:`4065`, :issue:`3433`, :issue:`3595`, :pull:`4195`).
  By `Deepak Cherian <https://github.com/dcherian>`_.
- Added :py:meth:`~core.accessor_dt.DatetimeAccessor.isocalendar()` that returns a Dataset
  with year, week, and weekday calculated according to the ISO 8601 calendar. Requires
  pandas version 1.1.0 or greater (:pull:`4534`). By `Mathias Hauser <https://github.com/mathause>`_,
  `Maximilian Roos <https://github.com/max-sixty>`_, and `Spencer Clark <https://github.com/spencerkclark>`_.
- :py:meth:`Dataset.to_zarr` now supports a ``region`` keyword for writing to
  limited regions of existing Zarr stores (:pull:`4035`).
  See :ref:`io.zarr.appending` for full details.
  By `Stephan Hoyer <https://github.com/shoyer>`_.
- Added typehints in :py:func:`align` to reflect that the same type received in ``objects`` arg will be returned (:pull:`4522`).
  By `Michal Baumgartner <https://github.com/m1so>`_.
- :py:meth:`Dataset.weighted` and :py:meth:`DataArray.weighted` are now executing value checks lazily if weights are provided as dask arrays (:issue:`4541`, :pull:`4559`).
  By `Julius Busecke <https://github.com/jbusecke>`_.
- Added the ``keep_attrs`` keyword to ``rolling_exp.mean()``; it now keeps attributes
  per default. By `Mathias Hauser <https://github.com/mathause>`_ (:pull:`4592`).
- Added ``freq`` as property to :py:class:`CFTimeIndex` and into the
  ``CFTimeIndex.repr``. (:issue:`2416`, :pull:`4597`)
  By `Aaron Spring <https://github.com/aaronspring>`_.

Bug fixes
~~~~~~~~~

- Fix bug where reference times without padded years (e.g. ``since 1-1-1``) would lose their units when
  being passed by :py:func:`encode_cf_datetime` (:issue:`4422`, :pull:`4506`). Such units are ambiguous
  about which digit represents the years (is it YMD or DMY?). Now, if such formatting is encountered,
  it is assumed that the first digit is the years, they are padded appropriately (to e.g. ``since 0001-1-1``)
  and a warning that this assumption is being made is issued. Previously, without ``cftime``, such times
  would be silently parsed incorrectly (at least based on the CF conventions) e.g. "since 1-1-1" would
  be parsed (via ``pandas`` and ``dateutil``) to ``since 2001-1-1``.
  By `Zeb Nicholls <https://github.com/znicholls>`_.
- Fix :py:meth:`DataArray.plot.step`. By `Deepak Cherian <https://github.com/dcherian>`_.
- Fix bug where reading a scalar value from a NetCDF file opened with the ``h5netcdf`` backend would raise a ``ValueError`` when ``decode_cf=True`` (:issue:`4471`, :pull:`4485`).
  By `Gerrit Holl <https://github.com/gerritholl>`_.
- Fix bug where datetime64 times are silently changed to incorrect values if they are outside the valid date range for ns precision when provided in some other units (:issue:`4427`, :pull:`4454`).
  By `Andrew Pauling <https://github.com/andrewpauling>`_
- Fix silently overwriting the ``engine`` key when passing :py:func:`open_dataset` a file object
  to an incompatible netCDF (:issue:`4457`). Now incompatible combinations of files and engines raise
  an exception instead. By `Alessandro Amici <https://github.com/alexamici>`_.
- The ``min_count`` argument to :py:meth:`DataArray.sum()` and :py:meth:`DataArray.prod()`
  is now ignored when not applicable, i.e. when ``skipna=False`` or when ``skipna=None``
  and the dtype does not have a missing value (:issue:`4352`).
  By `Mathias Hauser <https://github.com/mathause>`_.
- :py:func:`combine_by_coords` now raises an informative error when passing coordinates
  with differing calendars (:issue:`4495`). By `Mathias Hauser <https://github.com/mathause>`_.
- :py:attr:`DataArray.rolling` and :py:attr:`Dataset.rolling` now also keep the attributes and names of of (wrapped)
  ``DataArray`` objects, previously only the global attributes were retained (:issue:`4497`, :pull:`4510`).
  By `Mathias Hauser <https://github.com/mathause>`_.
- Improve performance where reading small slices from huge dimensions was slower than necessary (:pull:`4560`). By `Dion Häfner <https://github.com/dionhaefner>`_.
- Fix bug where ``dask_gufunc_kwargs`` was silently changed in :py:func:`apply_ufunc` (:pull:`4576`). By `Kai Mühlbauer <https://github.com/kmuehlbauer>`_.

Documentation
~~~~~~~~~~~~~
- document the API not supported with duck arrays (:pull:`4530`).
  By `Justus Magin <https://github.com/keewis>`_.
- Mention the possibility to pass functions to :py:meth:`Dataset.where` or
  :py:meth:`DataArray.where` in the parameter documentation (:issue:`4223`, :pull:`4613`).
  By `Justus Magin <https://github.com/keewis>`_.
- Update the docstring of :py:class:`DataArray` and :py:class:`Dataset`.
  (:pull:`4532`);
  By `Jimmy Westling <https://github.com/illviljan>`_.
- Raise a more informative error when :py:meth:`DataArray.to_dataframe` is
  is called on a scalar, (:issue:`4228`);
  By `Pieter Gijsbers <https://github.com/pgijsbers>`_.
- Fix grammar and typos in the :doc:`contributing` guide (:pull:`4545`).
  By `Sahid Velji <https://github.com/sahidvelji>`_.
- Fix grammar and typos in the :doc:`io` guide (:pull:`4553`).
  By `Sahid Velji <https://github.com/sahidvelji>`_.
- Update link to NumPy docstring standard in the :doc:`contributing` guide (:pull:`4558`).
  By `Sahid Velji <https://github.com/sahidvelji>`_.
- Add docstrings to ``isnull`` and ``notnull``, and fix the displayed signature
  (:issue:`2760`, :pull:`4618`).
  By `Justus Magin <https://github.com/keewis>`_.

Internal Changes
~~~~~~~~~~~~~~~~

- Optional dependencies can be installed along with xarray by specifying
  extras as ``pip install "xarray[extra]"`` where ``extra`` can be one of ``io``,
  ``accel``, ``parallel``, ``viz`` and ``complete``. See docs for updated
  :ref:`installation instructions <installation-instructions>`.
  (:issue:`2888`, :pull:`4480`).
  By `Ashwin Vishnu <https://github.com/ashwinvis>`_, `Justus Magin
  <https://github.com/keewis>`_ and `Mathias Hauser
  <https://github.com/mathause>`_.
- Removed stray spaces that stem from black removing new lines (:pull:`4504`).
  By `Mathias Hauser <https://github.com/mathause>`_.
- Ensure tests are not skipped in the ``py38-all-but-dask`` test environment
  (:issue:`4509`). By `Mathias Hauser <https://github.com/mathause>`_.
- Ignore select numpy warnings around missing values, where xarray handles
  the values appropriately, (:pull:`4536`);
  By `Maximilian Roos <https://github.com/max-sixty>`_.
- Replace the internal use of ``pd.Index.__or__`` and ``pd.Index.__and__`` with ``pd.Index.union``
  and ``pd.Index.intersection`` as they will stop working as set operations in the future
  (:issue:`4565`). By `Mathias Hauser <https://github.com/mathause>`_.
- Add GitHub action for running nightly tests against upstream dependencies (:pull:`4583`). 
  By `Anderson Banihirwe <https://github.com/andersy005>`_. 
- Ensure all figures are closed properly in plot tests (:pull:`4600`).
  By `Yash Saboo <https://github.com/yashsaboo>`_, `Nirupam K N
  <https://github.com/Nirupamkn>`_ and `Mathias Hauser
  <https://github.com/mathause>`_.

.. _whats-new.0.16.1:

v0.16.1 (2020-09-20)
---------------------

This patch release fixes an incompatibility with a recent pandas change, which
was causing an issue indexing with a ``datetime64``. It also includes
improvements to ``rolling``, ``to_dataframe``, ``cov`` & ``corr`` methods and
bug fixes. Our documentation has a number of improvements, including fixing all
doctests and confirming their accuracy on every commit.

Many thanks to the 36 contributors who contributed to this release:

Aaron Spring, Akio Taniguchi, Aleksandar Jelenak, Alexandre Poux,
Caleb, Dan Nowacki, Deepak Cherian, Gerardo Rivera, Jacob Tomlinson, James A.
Bednar, Joe Hamman, Julia Kent, Kai Mühlbauer, Keisuke Fujii, Mathias Hauser,
Maximilian Roos, Nick R. Papior, Pascal Bourgault, Peter Hausamann, Romain
Martinez, Russell Manser, Samnan Rahee, Sander, Spencer Clark, Stephan Hoyer,
Thomas Zilio, Tobias Kölling, Tom Augspurger, alexamici, crusaderky, darikg,
inakleinbottle, jenssss, johnomotani, keewis, and rpgoldman.

Breaking changes
~~~~~~~~~~~~~~~~

- :py:meth:`DataArray.astype` and :py:meth:`Dataset.astype` now preserve attributes. Keep the
  old behavior by passing `keep_attrs=False` (:issue:`2049`, :pull:`4314`).
  By `Dan Nowacki <https://github.com/dnowacki-usgs>`_ and `Gabriel Joel Mitchell <https://github.com/gajomi>`_.

New Features
~~~~~~~~~~~~

- :py:meth:`~xarray.DataArray.rolling` and :py:meth:`~xarray.Dataset.rolling`
  now accept more than 1 dimension. (:pull:`4219`)
  By `Keisuke Fujii <https://github.com/fujiisoup>`_.
- :py:meth:`~xarray.DataArray.to_datafra                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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