SPEC0 - support Python 3.12 to 3.14

.github/workflows/ci-tests.yml

@@ -35,18 +35,18 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.13"]
+        python-version: ["3.14"]
         session: ["doctest", "gallery"]
         include:
           - os: "ubuntu-latest"
-            python-version: "3.13"
+            python-version: "3.14"
             session: "tests"
             coverage: "--coverage"
           - os: "ubuntu-latest"
-            python-version: "3.12"
+            python-version: "3.13"
             session: "tests"
           - os: "ubuntu-latest"
-            python-version: "3.11"
+            python-version: "3.12"
             session: "tests"
 
     env:

.github/workflows/ci-wheels.yml

@@ -52,7 +52,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12", "3.13"]
+        python-version: ["3.12", "3.13", "3.14"]
         session: ["wheel"]
     env:
       ENV_NAME: "ci-wheels"

benchmarks/bm_runner.py

@@ -67,7 +67,7 @@ def _check_requirements(package: str) -> None:
 
 def _prep_data_gen_env() -> None:
     """Create or access a separate, unchanging environment for generating test data."""
-    python_version = "3.13"
+    python_version = "3.14"
     data_gen_var = "DATA_GEN_PYTHON"
     if data_gen_var in environ:
         echo("Using existing data generation environment.")

lib/iris/tests/integration/experimental/geovista/__init__.py

@@ -3,3 +3,11 @@
 # This file is part of Iris and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris.experimental.geovista` module."""
+
+import pytest
+
+# Skip this whole package if geovista (and by extension pyvista) is not available:
+pytest.importorskip(
+    "geovista",
+    reason="Skipping geovista integration tests as `geovista` is not installed",
+)

lib/iris/tests/test_coding_standards.py

@@ -12,6 +12,7 @@
 import subprocess
 from typing import List, Tuple
 
+from packaging.version import Version
 import pytest
 
 import iris
@@ -70,8 +71,9 @@ def test_python_versions():
     Test is designed to fail whenever Iris' supported Python versions are
     updated, insisting that versions are updated EVERYWHERE in-sync.
     """
-    latest_supported = "3.13"
-    all_supported = ["3.11", "3.12", latest_supported]
+    all_supported = ["3.12", "3.13", "3.14"]
+    _parsed = [Version(v) for v in all_supported]
+    latest_supported = str(max(_parsed))
 
     root_dir = Path(__file__).parents[3]
     workflows_dir = root_dir / ".github" / "workflows"

lib/iris/tests/unit/experimental/geovista/__init__.py

@@ -3,3 +3,10 @@
 # This file is part of Iris and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.geovista` module."""
+
+import pytest
+
+# Skip this whole package if geovista (and by extension pyvista) is not available:
+pytest.importorskip(
+    "geovista", reason="Skipping geovista unit tests as `geovista` is not installed"
+)

noxfile.py

@@ -15,7 +15,7 @@
 nox.options.reuse_existing_virtualenvs = True
 
 #: Python versions we can run sessions under
-_PY_VERSIONS_ALL = ["3.11", "3.12", "3.13"]
+_PY_VERSIONS_ALL = ["3.12", "3.13", "3.14"]
 _PY_VERSION_LATEST = _PY_VERSIONS_ALL[-1]
 
 #: One specific python version for docs builds

pyproject.toml

@@ -21,9 +21,9 @@ classifiers = [
     "Operating System :: Unix",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Atmospheric Science",
@@ -50,7 +50,7 @@ keywords = [
 license = "BSD-3-Clause"
 license-files = ["LICENSE"]
 name = "scitools-iris"
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 [project.urls]
 Code = "https://github.com/SciTools/iris"

requirements/locks/py312-linux-64.lock

@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/noarch/fonts-conda-ecosystem-1-0.tar.bz2#
 https://conda.anaconda.org/conda-forge/linux-64/libegl-1.7.0-ha4b6fd6_2.conda#c151d5eb730e9b7480e6d48c0fc44048
 https://conda.anaconda.org/conda-forge/linux-64/libopengl-1.7.0-ha4b6fd6_2.conda#7df50d44d4a14d6c31a2c54f2cd92157
 https://conda.anaconda.org/conda-forge/linux-64/libgcc-15.2.0-he0feb66_16.conda#6d0363467e6ed84f11435eb309f2ff06
-https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.15.2-hb03c661_0.conda#ada39f5726bc5481e9dce293709dfabc
+https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.15.3-hb03c661_0.conda#dcdc58c15961dbf17a0621312b01f5cb
 https://conda.anaconda.org/conda-forge/linux-64/attr-2.5.2-h39aace5_0.conda#791365c5f65975051e4e017b5da3abf5
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 https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.34.6-hb03c661_0.conda#920bb03579f15389b9e512095ad995b7
@@ -74,7 +74,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-hd590300_2.conda#172b
 https://conda.anaconda.org/conda-forge/linux-64/libgfortran-15.2.0-h69a702a_16.conda#40d9b534410403c821ff64f00d0adc22
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-https://conda.anaconda.org/conda-forge/linux-64/libpng-1.6.53-h421ea60_0.conda#00d4e66b1f746cb14944cad23fffb405
+https://conda.anaconda.org/conda-forge/linux-64/libpng-1.6.54-h421ea60_0.conda#d361fa2a59e53b61c2675bfa073e5b7e
 https://conda.anaconda.org/conda-forge/linux-64/libssh2-1.11.1-hcf80075_0.conda#eecce068c7e4eddeb169591baac20ac4
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 https://conda.anaconda.org/conda-forge/linux-64/libudunits2-2.2.28-h40f5838_3.conda#4bdace082e911a3e1f1f0b721bed5b56
@@ -105,12 +105,12 @@ https://conda.anaconda.org/conda-forge/linux-64/krb5-1.21.3-h659f571_0.conda#3f4
 https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.45-default_hbd61a6d_105.conda#3ec0aa5037d39b06554109a01e6fb0c6
 https://conda.anaconda.org/conda-forge/linux-64/libfreetype6-2.14.1-h73754d4_0.conda#8e7251989bca326a28f4a5ffbd74557a
 https://conda.anaconda.org/conda-forge/linux-64/libglib-2.86.3-h6548e54_0.conda#034bea55a4feef51c98e8449938e9cee
-https://conda.anaconda.org/conda-forge/linux-64/libjxl-0.11.1-hf08fa70_5.conda#82954a6f42e3fba59628741dca105c98
+https://conda.anaconda.org/conda-forge/linux-64/libjxl-0.11.1-hf08fa70_7.conda#3a29a37b34dbd06672bdccb63829ec14
 https://conda.anaconda.org/conda-forge/linux-64/libmo_unpack-3.1.2-hf484d3e_1001.tar.bz2#95f32a6a5a666d33886ca5627239f03d
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 https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.30-pthreads_h94d23a6_4.conda#be43915efc66345cccb3c310b6ed0374
 https://conda.anaconda.org/conda-forge/linux-64/librttopo-1.1.0-h46dd2a8_20.conda#df81fd57eacf341588d728c97920e86d
-https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.51.1-hf4e2dac_1.conda#b1f35e70f047918b49fb4b181e40300e
+https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.51.2-hf4e2dac_0.conda#da5be73701eecd0e8454423fd6ffcf30
 https://conda.anaconda.org/conda-forge/linux-64/libtheora-1.1.1-h4ab18f5_1006.conda#553281a034e9cf8693c9df49f6c78ea1
 https://conda.anaconda.org/conda-forge/linux-64/libtiff-4.7.1-h9d88235_1.conda#cd5a90476766d53e901500df9215e927
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@@ -132,7 +132,7 @@ https://conda.anaconda.org/conda-forge/linux-64/freexl-2.0.0-h9dce30a_2.conda#ec
 https://conda.anaconda.org/conda-forge/linux-64/gdk-pixbuf-2.44.4-h2b0a6b4_0.conda#c379d67c686fb83475c1a6ed41cc41ff
 https://conda.anaconda.org/conda-forge/linux-64/glib-tools-2.86.3-hf516916_0.conda#fd6acbf37b40cbe919450fa58309fbe1
 https://conda.anaconda.org/conda-forge/linux-64/gts-0.7.6-h977cf35_4.conda#4d8df0b0db060d33c9a702ada998a8fe
-https://conda.anaconda.org/conda-forge/linux-64/lcms2-2.17-h717163a_0.conda#000e85703f0fd9594c81710dd5066471
+https://conda.anaconda.org/conda-forge/linux-64/lcms2-2.18-h0c24ade_0.conda#6f2e2c8f58160147c4d1c6f4c14cbac4
 https://conda.anaconda.org/conda-forge/linux-64/libblas-3.11.0-5_h4a7cf45_openblas.conda#c160954f7418d7b6e87eaf05a8913fa9
 https://conda.anaconda.org/conda-forge/linux-64/libcups-2.3.3-hb8b1518_5.conda#d4a250da4737ee127fb1fa6452a9002e
 https://conda.anaconda.org/conda-forge/linux-64/libcurl-8.18.0-h4e3cde8_0.conda#0a5563efed19ca4461cf927419b6eb73
@@ -142,7 +142,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libkml-1.3.0-haa4a5bd_1022.conda
 https://conda.anaconda.org/conda-forge/linux-64/libxml2-2.15.1-he237659_1.conda#417955234eccd8f252b86a265ccdab7f
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 https://conda.anaconda.org/conda-forge/linux-64/python-3.12.12-hd63d673_1_cpython.conda#5c00c8cea14ee8d02941cab9121dce41
-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.51.1-h04a0ce9_1.conda#941ee610ebf7a8047140831091dcb1f7
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.51.2-h04a0ce9_0.conda#bb88d9335d09e54c7e6b5529d1856917
 https://conda.anaconda.org/conda-forge/linux-64/xcb-util-image-0.4.0-hb711507_2.conda#a0901183f08b6c7107aab109733a3c91
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 https://conda.anaconda.org/conda-forge/linux-64/xorg-libxext-1.3.6-hb9d3cd8_0.conda#febbab7d15033c913d53c7a2c102309d
@@ -166,7 +166,7 @@ https://conda.anaconda.org/conda-forge/linux-64/cython-3.2.4-py312h68e6be4_0.con
 https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.0-pyhd8ed1ab_0.conda#003b8ba0a94e2f1e117d0bd46aebc901
 https://conda.anaconda.org/conda-forge/noarch/docutils-0.21.2-pyhd8ed1ab_1.conda#24c1ca34138ee57de72a943237cde4cc
 https://conda.anaconda.org/conda-forge/noarch/execnet-2.1.2-pyhd8ed1ab_0.conda#a57b4be42619213a94f31d2c69c5dda7
-https://conda.anaconda.org/conda-forge/noarch/filelock-3.20.2-pyhd8ed1ab_0.conda#7e7cf4d6c2be6991e6ae2b3f4331701c
+https://conda.anaconda.org/conda-forge/noarch/filelock-3.20.3-pyhd8ed1ab_0.conda#2cfaaccf085c133a477f0a7a8657afe9
 https://conda.anaconda.org/conda-forge/linux-64/freetype-2.14.1-ha770c72_0.conda#4afc585cd97ba8a23809406cd8a9eda8
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@@ -219,7 +219,7 @@ https://conda.anaconda.org/conda-forge/noarch/sortedcontainers-2.4.0-pyhd8ed1ab_
 https://conda.anaconda.org/conda-forge/noarch/soupsieve-2.8.1-pyhd8ed1ab_0.conda#7de28c27fe620a4f7dbfaea137c6232b
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-jsmath-1.0.1-pyhd8ed1ab_1.conda#fa839b5ff59e192f411ccc7dae6588bb
 https://conda.anaconda.org/conda-forge/noarch/tblib-3.2.2-pyhcf101f3_0.conda#f88bb644823094f436792f80fba3207e
-https://conda.anaconda.org/conda-forge/noarch/tomli-2.3.0-pyhcf101f3_0.conda#d2732eb636c264dc9aa4cbee404b1a53
+https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.0-pyhcf101f3_0.conda#72e780e9aa2d0a3295f59b1874e3768b
 https://conda.anaconda.org/conda-forge/noarch/toolz-1.1.0-pyhd8ed1ab_1.conda#c07a6153f8306e45794774cf9b13bd32
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@@ -260,14 +260,14 @@ https://conda.anaconda.org/conda-forge/linux-64/libspatialite-5.1.0-gpl_h2abfd87
 https://conda.anaconda.org/conda-forge/linux-64/libvulkan-loader-1.4.328.1-h5279c79_0.conda#372a62464d47d9e966b630ffae3abe73
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-https://conda.anaconda.org/conda-forge/linux-64/numpy-2.4.0-py312h33ff503_0.conda#4ba148299453b88d8fa9b6351eaa0df8
+https://conda.anaconda.org/conda-forge/linux-64/numpy-2.4.1-py312h33ff503_0.conda#ba7e6cb06c372eae6f164623e6e06db8
 https://conda.anaconda.org/conda-forge/noarch/partd-1.4.2-pyhd8ed1ab_0.conda#0badf9c54e24cecfb0ad2f99d680c163
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-https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.36.0-pyhd8ed1ab_0.conda#c9a9b6e144b880308f5eedc905fe503d
+https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.36.1-pyhd8ed1ab_0.conda#6b0259cea8ffa6b66b35bae0ca01c447
 https://conda.anaconda.org/conda-forge/linux-64/xorg-libxtst-1.2.5-hb9d3cd8_3.conda#7bbe9a0cc0df0ac5f5a8ad6d6a11af2f
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@@ -290,7 +290,7 @@ https://conda.anaconda.org/conda-forge/noarch/pbr-7.0.3-pyhd8ed1ab_0.conda#d312c
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-https://conda.anaconda.org/conda-forge/linux-64/scipy-1.16.3-py312h54fa4ab_2.conda#e82683871cbc4bb257b7694f31a91327
+https://conda.anaconda.org/conda-forge/linux-64/scipy-1.17.0-py312h54fa4ab_0.conda#9faccce05511d05f22001ecc2dfe78de
 https://conda.anaconda.org/conda-forge/noarch/setuptools-scm-9.2.2-pyhd8ed1ab_0.conda#e2e4d7094d0580ccd62e2a41947444f3
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@@ -303,11 +303,11 @@ https://conda.anaconda.org/conda-forge/noarch/distributed-2025.12.0-pyhcf101f3_1
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+https://conda.anaconda.org/conda-forge/noarch/identify-2.6.16-pyhd8ed1ab_0.conda#8bc5851c415865334882157127e75799
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+https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.7.4-nompi_py312h25f8dc5_101.conda#b1c45859b7cfc04b81362fe7f0b75fa2
 https://conda.anaconda.org/conda-forge/noarch/pytest-cov-7.0.0-pyhcf101f3_1.conda#6891acad5e136cb62a8c2ed2679d6528
 https://conda.anaconda.org/conda-forge/noarch/pytest-mock-3.15.1-pyhd8ed1ab_0.conda#0511afbe860b1a653125d77c719ece53
 https://conda.anaconda.org/conda-forge/noarch/pytest-xdist-3.8.0-pyhd8ed1ab_0.conda#8375cfbda7c57fbceeda18229be10417