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Python 3.14 compatible deepcopy #6817

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Python 3.14 compatible deepcopy #6817

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d90d6c3
matplotlib/matplotlib#30198: Python 3.14 compatible deepcopy.
trexfeathers Nov 25, 2025
5562e99
What's New entry.
trexfeathers Nov 25, 2025
b24219d
What's new line break.
trexfeathers Nov 25, 2025
43cf6cc
Fix Sphinx bug with duplicated labels.
trexfeathers Nov 25, 2025
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11 changes: 11 additions & 0 deletions docs/src/whatsnew/3.14.rst
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Expand Up @@ -60,6 +60,9 @@ v3.14.1 (Date TBD)
#. Fixed compatibility with NumPy v2 for :meth:`~iris.coords.Coord.guess_bounds`
:ref:`See the full entry for more<3_14_1_guess_bounds>`.

#. Tentative compatibility with Python 3.14, pending full CI support later.
:ref:`See Dependencies for more<3_14_dependencies>`.

✨ Features
===========

Expand Down Expand Up @@ -166,6 +169,8 @@ v3.14.1 (Date TBD)
exceed the optimum chunksize set in dask. (:pull:`6730`)


.. _3_14_dependencies:

🔗 Dependencies
===============

Expand All @@ -178,6 +183,12 @@ v3.14.1 (Date TBD)
so we anticipate that these pins will be wanted for the v3.14 release.
(:issue:`6775`, :issue:`6776`, :issue:`6777`, :pull:`6773`)
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@trexfeathers trexfeathers Nov 26, 2025

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This entry will need modifying too since it implies that the Python pin is still there.


#. `@trexfeathers`_ provided tentative compatibility with Python 3.14 by fixing
:class:`~iris.coords.DimCoord` ``deepcopy`` behaviour. Note that CI coverage
for Python 3.14 is not yet possible due to problems in some fringe
dependencies, but the relevant tests have been shown to pass in :pull:`6816`.
(:issue:`6775`, :pull:`6817`)


📚 Documentation
================
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8 changes: 6 additions & 2 deletions docs/src/whatsnew/index.rst
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Expand Up @@ -6,11 +6,15 @@
What's New in Iris
------------------

.. include:: 3.14.rst
.. Commented out temporarily because Sphinx can't cope with a file that includes
labels being referenced twice.
include:: 3.14.rst
toctree::
:maxdepth: 1
:hidden:

.. toctree::
:maxdepth: 1
:hidden:

3.14.rst
3.13.rst
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8 changes: 7 additions & 1 deletion lib/iris/coords.py
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Expand Up @@ -2804,7 +2804,13 @@ def __deepcopy__(self, memo): # numpydoc ignore=SS02
Used if copy.deepcopy is called on a coordinate.

"""
new_coord = copy.deepcopy(super(), memo)
# Inspired by matplotlib#30198.
# Replicates the default copy behaviour, which can then be modified below.
cls = self.__class__
memo[id(self)] = new_coord = cls.__new__(cls)
for key, val in self.__dict__.items():
setattr(new_coord, key, copy.deepcopy(val, memo))

# Ensure points and bounds arrays are read-only.
new_coord._values_dm.data.flags.writeable = False
if new_coord._bounds_dm is not None:
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