Drops Python 3.8 support (#557)

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version: [3.9, "3.10", "3.11", "3.12", "3.13"]
     steps:
       - uses: actions/checkout@v4
       - name: Install the latest version of uv

README.rst

@@ -23,9 +23,9 @@ Contributing
 The easiest way to contribute is to use Cosmic Ray and submit reports for defects or any other issues you come across.
 Please see CONTRIBUTING.rst for more details.
 
-.. |Python version| image:: https://img.shields.io/badge/Python_version-3.8+-blue.svg
+.. |Python version| image:: https://img.shields.io/badge/Python_version-3.9+-blue.svg
    :target: https://www.python.org/
-.. |Python version windows| image:: https://img.shields.io/badge/Python_version_(windows)-3.8+-blue.svg
+.. |Python version windows| image:: https://img.shields.io/badge/Python_version_(windows)-3.9+-blue.svg
    :target: https://www.python.org/
 .. |Build Status| image:: https://github.com/sixty-north/cosmic-ray/actions/workflows/python-package.yml/badge.svg
    :target: https://github.com/sixty-north/cosmic-ray/actions/workflows/python-package.yml

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = 'setuptools.build_meta'
 
 [project]
 name = "cosmic_ray"
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 dynamic = ["version"]
 authors = [{ name = "Sixty North AS", email = "austin@sixty-north.com" }]
 description = "Mutation testing"
@@ -17,7 +17,6 @@ classifiers = [
   "License :: OSI Approved :: MIT License",
   "Operating System :: OS Independent",
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -103,9 +102,9 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "UP", # PYUPGRADE
-  "I", # ISORT
+  "I",  # ISORT
 ]
 
 [tool.ruff.lint.isort]
 case-sensitive = true
-known-first-party = ["cosmic_ray"]
+known-first-party = ["cosmic_ray"]

src/cosmic_ray/commands/init.py

@@ -2,7 +2,7 @@
 
 import logging
 import uuid
-from typing import Iterable
+from collections.abc import Iterable
 
 import cosmic_ray.modules
 import cosmic_ray.plugins

src/cosmic_ray/mutating.py

@@ -4,10 +4,10 @@
 import difflib
 import logging
 import traceback
+from collections.abc import Iterable
 from contextlib import contextmanager
 from itertools import chain
 from pathlib import Path
-from typing import Iterable
 
 import cosmic_ray.plugins
 from cosmic_ray.ast import Visitor, get_ast

src/cosmic_ray/operators/operator.py

@@ -2,7 +2,8 @@
 
 import dataclasses
 from abc import ABC, abstractmethod
-from typing import Optional, Sequence
+from collections.abc import Sequence
+from typing import Optional
 
 
 class Operator(ABC):

src/cosmic_ray/work_item.py

@@ -4,7 +4,7 @@
 import enum
 import pathlib
 from pathlib import Path
-from typing import Any, Dict, Optional, Tuple
+from typing import Any, Optional
 
 
 class StrEnum(str, enum.Enum):
@@ -60,9 +60,9 @@ class MutationSpec:
     module_path: Path
     operator_name: str
     occurrence: int
-    start_pos: Tuple[int, int]
-    end_pos: Tuple[int, int]
-    operator_args: Dict[str, Any] = dataclasses.field(default_factory=dict)
+    start_pos: tuple[int, int]
+    end_pos: tuple[int, int]
+    operator_args: dict[str, Any] = dataclasses.field(default_factory=dict)
 
     # pylint: disable=R0913
     def __post_init__(self):
@@ -86,7 +86,7 @@ class WorkItem:
     """
 
     job_id: str
-    mutations: Tuple[MutationSpec]
+    mutations: tuple[MutationSpec]
 
     @classmethod
     def single(cls, job_id, mutation: MutationSpec):