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/coords.py

@@ -2800,7 +2800,13 @@ 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:

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"

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",
@@ -50,9 +50,7 @@ keywords = [
 license = "BSD-3-Clause"
 license-files = ["LICENSE"]
 name = "scitools-iris"
-# NOTE: currently pinning to avoid Python 3.14
-#  see : https://github.com/SciTools/iris/issues/6775
-requires-python = ">=3.11,<3.14"
+requires-python = ">=3.12"
 
 [project.urls]
 Code = "https://github.com/SciTools/iris"

requirements/py311.yml → requirements/py314.yml

@@ -4,7 +4,7 @@ channels:
   - conda-forge
 
 dependencies:
-  - python =3.11
+  - python =3.14
 
 # Setup dependencies.
   - setuptools >=77.0.3