Move from setuptools to flit

Closes pypa#340

Author: brettcannon

.github/workflows/lint.yml

@@ -3,31 +3,31 @@ name: Linting
 on:
   pull_request:
     paths:
-      - '**.py'
+      - "**.py"
   push:
     paths:
-      - '**.py'
+      - "**.py"
 
 jobs:
   lint:
     name: nox -s lint
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+      - uses: actions/checkout@v1
 
-    - uses: actions/setup-python@v2
-      name: Install Python
-      with:
-        python-version: '3.9'
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: "3.9"
 
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install --upgrade nox
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade nox
 
-    - name: Run `nox -s lint`
-      run: python -m nox -s lint
+      - name: Run `nox -s lint`
+        run: python -m nox -s lint
 
   build:
     name: Build sdist and wheel
@@ -39,21 +39,21 @@ jobs:
     needs: lint
 
     steps:
-    - uses: actions/checkout@v1
+      - uses: actions/checkout@v1
 
-    - uses: actions/setup-python@v2
-      name: Install Python
-      with:
-        python-version: '3.9'
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: "3.9"
 
-    - name: Install dependencies
-      run: python -m pip install --upgrade setuptools wheel
+      - name: Install dependencies
+        run: python -m pip install --upgrade build
 
-    - name: Build
-      run: python setup.py sdist bdist_wheel
+      - name: Build
+        run: python -m build
 
-    - name: Archive files
-      uses: actions/upload-artifact@v1
-      with:
-        name: dist
-        path: dist
+      - name: Archive files
+        uses: actions/upload-artifact@v1
+        with:
+          name: dist
+          path: dist

.pre-commit-config.yaml

@@ -1,37 +1,32 @@
 repos:
-- repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v2.3.0
-  hooks:
-  - id: check-toml
-  - id: check-yaml
-  - id: end-of-file-fixer
-  - id: trailing-whitespace
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: check-toml
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
 
-- repo: https://github.com/pre-commit/mirrors-mypy
-  rev: v0.790
-  hooks:
-  - id: mypy
-    exclude: '^(docs|tasks|tests)|setup\.py'
-    args: []
-  - id: mypy
-    name: mypy for Python 2
-    exclude: '^(docs|tasks|tests)|setup\.py|noxfile\.py'
-    args: ['--py2']
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.790
+    hooks:
+      - id: mypy
+        exclude: '^(docs|tasks|tests)|setup\.py'
+        args: []
+      - id: mypy
+        name: mypy for Python 2
+        exclude: '^(docs|tasks|tests)|setup\.py|noxfile\.py'
+        args: ["--py2"]
 
-- repo: https://github.com/psf/black
-  rev: 19.3b0
-  hooks:
-  - id: black
+  - repo: https://github.com/psf/black
+    rev: 19.3b0
+    hooks:
+      - id: black
 
-- repo: https://gitlab.com/PyCQA/flake8
-  rev: '3.7.8'
-  hooks:
-  - id: flake8
-    additional_dependencies: ['pep8-naming']
-    # Ignore all format-related checks as Black takes care of those.
-    args: ['--ignore', 'E2,W5', '--select', 'E,W,F,N']
-
-- repo: https://github.com/mgedmin/check-manifest
-  rev: '0.39'
-  hooks:
-  - id: check-manifest
+  - repo: https://gitlab.com/PyCQA/flake8
+    rev: "3.7.8"
+    hooks:
+      - id: flake8
+        additional_dependencies: ["pep8-naming"]
+        # Ignore all format-related checks as Black takes care of those.
+        args: ["--ignore", "E2,W5", "--select", "E,W,F,N"]

MANIFEST.in

@@ -48,11 +48,11 @@
 
 base_dir = os.path.join(os.path.dirname(__file__), os.pardir)
 about = {}
-with open(os.path.join(base_dir, "packaging", "__about__.py")) as f:
+with open(os.path.join(base_dir, "packaging", "__init__.py")) as f:
     exec(f.read(), about)
 
 version = release = about["__version__"]
-copyright = about["__copyright__"]
+copyright = "Copyright 2014-2019 Donald Stufft and individual contributors"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.

docs/conf.py

@@ -1,6 +1,3 @@
-[bdist_wheel]
-universal=1
-
 [mypy]
 ignore_missing_imports = True
 

setup.cfg mypy.ini

@@ -25,6 +25,7 @@ def tests(session):
     def coverage(*args):
         session.run("python", "-m", "coverage", *args)
 
+    # Once coverage 5 is used then `.coverage` can move into `pyproject.toml`.
     session.install("coverage<5.0.0", "pretend", "pytest", "pip>=9.0.2")
 
     if "pypy" not in session.python:
@@ -52,8 +53,8 @@ def lint(session):
     session.run("pre-commit", "run", "--all-files")
 
     # Check the distribution
-    session.install("setuptools", "twine", "wheel")
-    session.run("python", "setup.py", "--quiet", "sdist", "bdist_wheel")
+    session.install("build", "twine")
+    session.run("python", "-m", "build")
     session.run("twine", "check", *glob.glob("dist/*"))
 
 
@@ -123,10 +124,10 @@ def release(session):
     # Checkout the git tag.
     session.run("git", "checkout", "-q", release_version, external=True)
 
-    session.install("twine", "setuptools", "wheel")
+    session.install("build", "twine")
 
     # Build the distribution.
-    session.run("python", "setup.py", "sdist", "bdist_wheel")
+    session.run("python", "-m", "build")
 
     # Check what files are in dist/ for upload.
     files = sorted(glob.glob("dist/*"))

noxfile.py

@@ -1,26 +1,5 @@
 # This file is dual licensed under the terms of the Apache License, Version
 # 2.0, and the BSD License. See the LICENSE file in the root of this repository
 # for complete details.
-from __future__ import absolute_import, division, print_function
-
-from .__about__ import (
-    __author__,
-    __copyright__,
-    __email__,
-    __license__,
-    __summary__,
-    __title__,
-    __uri__,
-    __version__,
-)
-
-__all__ = [
-    "__title__",
-    "__summary__",
-    "__uri__",
-    "__version__",
-    "__author__",
-    "__email__",
-    "__license__",
-    "__copyright__",
-]
+"""Core utilities for Python packages"""
+__version__ = "20.5.dev0"

packaging/__about__.py

@@ -0,0 +1,30 @@
+[build-system]
+requires = ["flit_core >=2,<4"]
+build-backend = "flit_core.buildapi"
+
+[tool.flit.metadata]
+module = "packaging"
+author = "Donald Stufft and individual contributors"
+author-email = "donald@stufft.io"
+home-page = "https://github.com/pypa/packaging"
+description-file = "README.rst"
+requires-python = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+requires = ["pyparsing>=2.0.2"]
+classifiers = [
+        "Development Status :: 5 - Production/Stable",
+        "Intended Audience :: Developers",
+        "License :: OSI Approved :: Apache Software License",
+        "License :: OSI Approved :: BSD License",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: Implementation :: CPython",
+        "Programming Language :: Python :: Implementation :: PyPy",
+]