DEP: drop support for CPython 3.9

Author: neutrinoceros

.github/workflows/build-test.yaml

@@ -22,43 +22,51 @@ jobs:
       # run all tests even if e.g. image tests fail early
       fail-fast: false
       matrix:
-        os: [
-          macos-latest,
-          windows-latest,
-          ubuntu-latest,
-        ]
+        os:
+          - ubuntu-latest
+          - macos-latest
         python-version: ['3.12']
         dependencies: [full]
         tests-type: [unit]
         test-runner: [pytest]
+        venv-loc: [bin]
         include:
+          - os: windows-latest
+            python-version: '3.12'
+            dependencies: full
+            tests-type: unit
+            test-runner: pytest
+            venv-loc: Scripts
           - os: ubuntu-20.04
-            python-version: '3.9.2'
+            python-version: '3.10.3'
             dependencies: minimal
             tests-type: unit
             test-runner: pytest
+            venv-loc: bin
           - os: ubuntu-latest
             # this job is necessary for non-answer, 'yield' based tests
-            # because pytest doesn't support such tests, and nose is not
-            # compatible with Python 3.10
-            python-version: '3.9'
+            # because pytest doesn't support such tests
+            python-version: '3.10'
             dependencies: full
             tests-type: unit
             test-runner: nose
+            venv-loc: bin
           - os: ubuntu-latest
             # answer tests use 'yield', so they require nose
             # they are also attached to a specific, occasionally updated, Python version
             # but it does *not* have to match the current minimal supported version
-            python-version: '3.9'
+            python-version: '3.10'
             dependencies: full
             tests-type: answer
             test-runner: nose
+            venv-loc: bin
           - os: ubuntu-latest
             # minimal tests with latest Python and no optional dependencies
             python-version: '3.x'
             dependencies: ''
             tests-type: unit
             test-runner: pytest
+            venv-loc: bin
 
     runs-on: ${{ matrix.os }}
 
@@ -84,15 +92,34 @@ jobs:
       shell: bash
       env:
         dependencies: ${{ matrix.dependencies }}
-      run: source ./tests/ci_install.sh
+      run: |
+        python -m venv .venv
+        source .venv/${{matrix.venv-loc}}/activate
+        source ./tests/ci_install.sh
+
+    - name: Install and patch nosetest
+      if: matrix.test-runner == 'nose'
+      run: |
+        source .venv/${{matrix.venv-loc}}/activate
+        python -m pip install -r nose_requirements.txt
+        find .venv/lib/python${{matrix.python-version}}/site-packages/nose -name '*.py' \
+          -exec sed -i -e s/collections.Callable/collections.abc.Callable/g '{}' ';'
+
+    - name: Show final env
+      run: |
+        source .venv/${{matrix.venv-loc}}/activate
+        python -m pip list
 
-    - run: python -m pip list
     - name: Run Unit Tests (pytest)
       if: matrix.test-runner == 'pytest'
-      run: pytest --color=yes
+      run: |
+        source .venv/${{matrix.venv-loc}}/activate
+        pytest --color=yes
     - name: Run Tests (nose)
       if: matrix.test-runner == 'nose'
-      run: cat nose_ignores.txt | xargs python -m nose -c nose_unit.cfg --traverse-namespace
+      run: |
+        source .venv/${{matrix.venv-loc}}/activate
+        cat nose_ignores.txt | xargs python -m nose -c nose_unit.cfg --traverse-namespace
 
   image-tests:
     name: Image tests

.github/workflows/type-checking.yaml

@@ -32,7 +32,7 @@ jobs:
         # run with oldest supported python version
         # so that we always get compatible versions of
         # core dependencies at type-check time
-        python-version: '3.9'
+        python-version: '3.10'
 
     - name: Build
       run: |

.github/workflows/wheels.yaml

@@ -51,7 +51,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.10'
 
       - name: Build sdist
         run: pipx run build --sdist

.pre-commit-config.yaml

@@ -43,8 +43,6 @@ repos:
     args: [
       --fix,
       --show-fixes,
-      # the following line can be removed after support for Python 3.9 is dropped
-      --extend-select=B905, # zip-without-explicit-strict
     ]
 
 -   repo: https://github.com/pre-commit/pygrep-hooks

doc/source/installing.rst

@@ -32,7 +32,9 @@ Here's a summary for most recent releases
 +------------+------------+----------------+-----------------+
 | yt release | Python 2.7 | Python3 min    | Python3 max     |
 +============+============+================+=================+
-| 4.3.x      | no         | 3.9            | 3.12 (expected) |
+| 4.4.x      | no         | 3.10.3         | 3.13 (expected) |
++------------+------------+----------------|-----------------|
+| 4.3.x      | no         | 3.9.2          | 3.12            |
 +------------+------------+----------------+-----------------+
 | 4.2.x      | no         | 3.8            | 3.11            |
 +------------+------------+----------------+-----------------+

nose_requirements.txt

@@ -0,0 +1,3 @@
+nose~=1.3.7
+nose-exclude
+nose-timer~=1.0.0

pyproject.toml

@@ -30,7 +30,6 @@ classifiers = [
     "Programming Language :: C",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -41,17 +40,17 @@ classifiers = [
 keywords = [
     "astronomy astrophysics visualization amr adaptivemeshrefinement",
 ]
-requires-python = ">=3.9.2"
+requires-python = ">=3.10.3"
 dependencies = [
     "cmyt>=1.1.2",
     "ewah-bool-utils>=1.2.0",
     "matplotlib>=3.5",
     "more-itertools>=8.4",
-    "numpy>=1.19.3, <3", # keep minimal requirement in sync with NPY_TARGET_VERSION
+    "numpy>=1.21.3, <3", # keep minimal requirement in sync with NPY_TARGET_VERSION
     # https://github.com/numpy/numpy/issues/27037
     "numpy!=2.0.1 ; platform_machine=='arm64' and platform_system=='Darwin'",
     "packaging>=20.9",
-    "pillow>=8.0.0",
+    "pillow>=8.3.2",
     "tomli-w>=0.4.0",
     "tqdm>=3.4.0",
     "unyt>=2.9.2",
@@ -212,9 +211,9 @@ minimal = [
     "ewah-bool-utils==1.2.0",
     "matplotlib==3.5",
     "more-itertools==8.4",
-    "numpy==1.19.3",
+    "numpy==1.21.3",
     "packaging==20.9",
-    "pillow==8.0.0",
+    "pillow==8.3.2",
     "tomli-w==0.4.0",
     "tqdm==3.4.0",
     "unyt==2.9.2",
@@ -226,9 +225,6 @@ test = [
     "pytest>=6.1",
     "pytest-mpl>=0.16.1",
     "sympy!=1.10,!=1.9", # see https://github.com/sympy/sympy/issues/22241
-    "nose~=1.3.7; python_version < '3.10'",
-    "nose-exclude; python_version < '3.10'",
-    "nose-timer~=1.0.0; python_version < '3.10'",
     "imageio!=2.35.0", # see https://github.com/yt-project/yt/issues/4966
 ]
 typecheck = [
@@ -486,7 +482,7 @@ ignore = [
 
 
 [tool.mypy]
-python_version = 3.9
+python_version = '3.10'
 show_error_codes = true
 ignore_missing_imports = true
 warn_unused_configs = true
@@ -496,7 +492,7 @@ show_error_context = true
 exclude = "(test_*|lodgeit)"
 
 [tool.cibuildwheel]
-build = "cp39-* cp310-* cp311-* cp312-*"
+build = "cp310-* cp311-* cp312-*"
 build-verbosity = 1
 test-skip = "*-musllinux*"
 test-extras = "test"

setupext.py

@@ -397,7 +397,7 @@ def get_python_include_dirs():
 NUMPY_MACROS = [
     ("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION"),
     # keep in sync with runtime requirements (pyproject.toml)
-    ("NPY_TARGET_VERSION", "NPY_1_19_API_VERSION"),
+    ("NPY_TARGET_VERSION", "NPY_1_21_API_VERSION"),
 ]
 
 

tests/ci_install.sh

@@ -5,11 +5,6 @@ cp tests/matplotlibrc .
 
 # Step 1: pre-install required packages
 if [[ ${dependencies} == "full" || ${dependencies} == "cartopy" ]]; then
-    # upgrading pip to guarantee installing extra dependencies with [full] is supported
-    # this is only necessary for some versions of Python 3.8 and 3.9
-    # see https://github.com/yt-project/yt/issues/4270
-    python -m pip install 'pip>=21.2'
-
     case ${RUNNER_OS} in
     linux|Linux)
         sudo apt-get -qqy update