Move metadata to pyproject + drop Python 3.7

.github/workflows/test.yml

@@ -16,15 +16,15 @@ permissions: {}
 
 jobs:
   lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     permissions:
       contents: read
 
     steps:
     - uses: actions/checkout@v4
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: 3.11
 
@@ -37,7 +37,7 @@ jobs:
       run: tox -e lint
 
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     permissions:
       contents: read
@@ -46,19 +46,18 @@ jobs:
       fail-fast: false
       matrix:
         python: [
-          "3.7.1",
-          "3.7",
           "3.8",
           "3.9",
           "3.10",
           "3.11",
           "3.12",
+          "3.13",
         ]
 
     steps:
     - uses: actions/checkout@v4
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python }}
         allow-prereleases: true

MANIFEST.in

@@ -1 +1,6 @@
-include LICENSE
+# files necessary for testing sdist
+graft tests
+include tox.ini
+
+global-exclude *.py[cod]
+global-exclude .DS_Store

pyproject.toml

@@ -0,0 +1,34 @@
+[build-system]
+requires      = ["setuptools>=75.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name        = "mypy_extensions"
+version     = "1.0.0-dev"
+description = "Type system extensions for programs checked with the mypy type checker."
+readme      = "README.md"
+authors     = [
+    {name = "The mypy developers", email = "jukka.lehtosalo@iki.fi"}
+]
+license     = {text = "MIT"}
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Software Development",
+]
+requires-python = ">=3.9"
+
+[project.urls]
+Homepage = "https://github.com/python/mypy_extensions"
+
+[tool.setuptools]
+py-modules = ["mypy_extensions"]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
-minversion = 2.9.1
+minversion = 4.4.4
 skip_missing_interpreters = true
-envlist = py37, py38, py39, py310, py311, py312
+envlist = py38, py39, py310, py311, py312, py313
 
 [testenv]
 description = run the test driver with {basepython}