chore: drop Python 2, require Python 3.6+ (#91)

* chore: drop Python 2 support, require 3.6+

* style: run pre-commit

Author: henryiii

.appveyor.yml

@@ -9,7 +9,6 @@ environment:
     PYTHONWARNINGS: ignore:DEPRECATION
     MSSdk: 1
   matrix:
-  - PYTHON: 27
   - PYTHON: 36
 install:
 - cmd: '"%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" %PLATFORM%'

.github/workflows/conda.yml

@@ -30,7 +30,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           channels: conda-forge
-          
+
       - name: Prepare
         run: conda install conda-build conda-verify
 

.github/workflows/pip.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: ["2.7", "3.5", "3.8", "3.9"]
+        python-version: ["3.6", "3.10"]
 
     runs-on: ${{ matrix.platform }}
 
@@ -27,22 +27,6 @@ jobs:
     - name: Add requirements
       run: python -m pip install --upgrade wheel setuptools
 
-    # Eventually Microsoft might have an action for setting up
-    # MSVC, but for now, this action works:
-    - name: Prepare compiler environment for Windows 🐍 2.7
-      if: matrix.python-version == 2.7 && runner.os == 'Windows'
-      uses: ilammy/msvc-dev-cmd@v1
-      with:
-        arch: x64
-
-    # This makes two environment variables available in the following step(s)
-    - name: Set Windows 🐍 2.7 environment variables
-      if: matrix.python-version == 2.7 && runner.os == 'Windows'
-      shell: bash
-      run: |
-        echo "DISTUTILS_USE_SDK=1" >> $GITHUB_ENV
-        echo "MSSdk=1" >> $GITHUB_ENV
-
     - name: Build and install
       run: pip install --verbose .
 

.github/workflows/wheels.yml

@@ -10,12 +10,6 @@ on:
     types:
       - published
 
-env:
-  CIBW_TEST_COMMAND: python {project}/tests/test.py
-  CIBW_ARCHS_MACOS: auto universal2
-  CIBW_TEST_SKIP: "*universal2:arm64"
-
-
 jobs:
   build_sdist:
     name: Build SDist
@@ -45,11 +39,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: pypa/cibuildwheel@v1.12.0
+    - uses: pypa/cibuildwheel@v2.2.0
       env:
-        # Python 2.7 on Windows requires a workaround for C++11 support,
-        # built separately below
-        CIBW_SKIP: cp27-win*
+        CIBW_ARCHS_MACOS: auto universal2
 
     - name: Verify clean directory
       run: git diff --exit-code
@@ -61,48 +53,9 @@ jobs:
         path: wheelhouse/*.whl
 
 
-  # Windows 2.7 (requires workaround for MSVC 2008 replacement)
-  build_win27_wheels:
-    name: Py 2.7 wheels on Windows
-    runs-on: windows-latest
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-
-    - uses: ilammy/msvc-dev-cmd@v1
-
-    - name: Build 64-bit wheel
-      uses: pypa/cibuildwheel@v1.12.0
-      env:
-        CIBW_BUILD: cp27-win_amd64
-        DISTUTILS_USE_SDK: 1
-        MSSdk: 1
-
-    - uses: ilammy/msvc-dev-cmd@v1
-      with:
-        arch: x86
-
-    - name: Build 32-bit wheel
-      uses: pypa/cibuildwheel@v1.12.0
-      env:
-        CIBW_BUILD: cp27-win32
-        DISTUTILS_USE_SDK: 1
-        MSSdk: 1
-
-    - name: Verify clean directory
-      run: git diff --exit-code
-      shell: bash
-
-    - uses: actions/upload-artifact@v2
-      with:
-        path: wheelhouse/*.whl
-
-
   upload_all:
     name: Upload if release
-    needs: [build_wheels, build_win27_wheels, build_sdist]
+    needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
     if: github.event_name == 'release' && github.event.action == 'published'
 

.pre-commit-config.yaml

@@ -0,0 +1,66 @@
+# To use:
+#
+#     pre-commit run -a
+#
+# Or:
+#
+#     pre-commit install  # (runs every time you commit in git)
+#
+# To update this file:
+#
+#     pre-commit autoupdate
+#
+# See https://github.com/pre-commit/pre-commit
+
+ci:
+  autoupdate_commit_msg: "chore: update pre-commit hooks"
+  autofix_commit_msg: "style: pre-commit fixes"
+
+repos:
+# Standard hooks
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.0.1
+  hooks:
+  - id: check-added-large-files
+  - id: check-case-conflict
+  - id: check-merge-conflict
+  - id: check-symlinks
+  - id: check-yaml
+    exclude: ^conda\.recipe/meta\.yaml$
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: mixed-line-ending
+  - id: requirements-txt-fixer
+  - id: trailing-whitespace
+
+# Black, the code formatter, natively supports pre-commit
+- repo: https://github.com/psf/black
+  rev: 21.9b0
+  hooks:
+  - id: black
+    files: ^(docs)
+
+# Sort your imports in a standard form
+- repo: https://github.com/PyCQA/isort
+  rev: 5.9.3
+  hooks:
+  - id: isort
+
+# Upgrade older Python syntax
+- repo: https://github.com/asottile/pyupgrade
+  rev: v2.29.0
+  hooks:
+  - id: pyupgrade
+    args: ["--py36-plus"]
+
+# Changes tabs to spaces
+- repo: https://github.com/Lucas-C/pre-commit-hooks
+  rev: v1.1.10
+  hooks:
+  - id: remove-tabs
+
+# Suggested hook if you add a .clang-format file
+# - repo: https://github.com/pre-commit/mirrors-clang-format
+#  rev: v13.0.0
+#  hooks:
+#  - id: clang-format

README.md

@@ -21,42 +21,21 @@ python_example
 [actions-wheels-link]:     https://github.com/pybind/python_example/actions?query=workflow%3AWheels
 [actions-wheels-badge]:    https://github.com/pybind/python_example/workflows/Wheels/badge.svg
 [travis-link]:             https://travis-ci.org/pybind/python_example
-[travis-badge]:            https://travis-ci.org/pybind/python_example.svg?branch=master&status=passed 
+[travis-badge]:            https://travis-ci.org/pybind/python_example.svg?branch=master&status=passed
 [appveyor-link]:           https://ci.appveyor.com/project/wjakob/python-example
 <!-- TODO: get a real badge link for appveyor -->
 [appveyor-badge]:          https://travis-ci.org/pybind/python_example.svg?branch=master&status=passed
 
 An example project built with [pybind11](https://github.com/pybind/pybind11).
+This requires Python 3.6+; for older versions of Python, check the commit
+history.
 
 Installation
 ------------
 
-**On Unix (Linux, OS X)**
-
  - clone this repository
  - `pip install ./python_example`
 
-**On Windows (Requires Visual Studio 2015)**
-
- - For Python 3.5+:
-     - clone this repository
-     - `pip install ./python_example`
- - For Python 2.7:
-
-   Pybind11 requires a C++11 compliant compiler (i.e. Visual Studio 2015 on
-   Windows). Running a regular `pip install` command will detect the version
-   of the compiler used to build Python and attempt to build the extension
-   with it. We must force the use of Visual Studio 2015.
-
-     - clone this repository
-     - `"%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x64`
-     - `set DISTUTILS_USE_SDK=1`
-     - `set MSSdk=1`
-     - `pip install ./python_example`
-
-   Note that this requires the user building `python_example` to have registry edition
-   rights on the machine, to be able to run the `vcvarsall.bat` script.
-
 CI Examples
 -----------
 
@@ -65,14 +44,6 @@ binary "wheels" for all platforms is illustrated in the "wheels.yml" file,
 using [`cibuildwheel`][]. You can also see a basic recipe for building and
 testing in `pip.yml`, and `conda.yml` has an example of a conda recipe build.
 
-Windows Python 2.7 runtime requirements
-----------------------------
-
-On Windows, the Visual C++ 2015 redistributable packages are a runtime
-requirement for this project if you build for Python 2.7 (newer versions of
-Python include this redistributable). It can be found
-[here](https://www.microsoft.com/en-us/download/details.aspx?id=48145).
-
 
 Building the documentation
 --------------------------