Add support for Python 3.12

.github/workflows/python-package.yml

@@ -92,15 +92,16 @@ jobs:
           - '3.9'
           - '3.10'
           - '3.11'
-          - '3.12-dev'
+          - '3.12'
+          - '3.13-dev'
         constraints: ['']
         post_install: ['']
         include:
           - os: ubuntu-latest
             python-version: '3.8'
             constraints: '--constraint constraints-oldest.txt'
           - os: ubuntu-latest
-            python-version: '3.11'
+            python-version: '3.12'
             post_install: pip install -r constraints-future.txt
                                       --upgrade --upgrade-strategy=eager
     needs:
@@ -128,7 +129,7 @@ jobs:
       - name: Downgrade target-version when running oldest supported Black
         if: matrix.constraints == '--constraint constraints-oldest.txt'
         run: |
-          sed -i 's/py311/py39/' pyproject.toml
+          sed -i 's/, "py311", "py312"//' pyproject.toml
       - run: pytest
 
   build-sdist-validate-dists:

CHANGES.rst

@@ -7,6 +7,7 @@ Added
 -----
 - Mark the Darker package as annotated with type hints.
 - Update to ``ioggstream/[email protected]`` in CI.
+- Support for Python 3.12 in the package metadata and the CI build.
 
 Removed
 -------

README.rst

@@ -405,7 +405,7 @@ project's root directory, or to a different TOML file specified using the ``-c``
    line-length = 88                  # Overridden by [tool.darker] above
    skip-magic-trailing-comma = false
    skip-string-normalization = false
-   target-version = ['py311']
+   target-version = ["py38", "py39", "py310", "py311", "py312"]
    exclude = "test_*\.py"
    extend_exclude = "/generated/"
    force_exclude = ".*\.pyi"

pyproject.toml

@@ -6,7 +6,7 @@ requires = ["setuptools", "wheel"]  # PEP 508 specifications.
 # Darker makes Black read its configuration from the file indicated by the `--config`
 # option, so we need to mirror the same configuration here and in `check-darker.toml`.
 skip-string-normalization = false
-target-version = ["py311"]
+target-version = ["py38", "py39", "py310", "py311", "py312"]
 
 [tool.isort]
 # Darker makes isort read its configuration from the file indicated by the `--config`

setup.cfg

@@ -14,6 +14,7 @@ classifiers =
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
 project_urls =
     Source Code = https://github.com/akaihola/darker
     Change Log = https://github.com/akaihola/darker/blob/master/CHANGES.rst

src/darker/verification.py

@@ -12,7 +12,7 @@
     from black.parsing import ASTSafetyError  # pylint: disable=ungrouped-imports
 except ImportError:
     # Black 24.2.0 and earlier
-    ASTSafetyError = AssertionError
+    ASTSafetyError = AssertionError  # type: ignore[assignment,misc]
 
 
 class NotEquivalentError(Exception):