chore: Python 3.9 support

Author: Stranger6667

.github/workflows/build.yml

@@ -97,7 +97,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.5', '3.6', '3.7', '3.8']
+        python-version: ['3.5', '3.6', '3.7', '3.8', '3.9']
 
     name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}

.github/workflows/python-release.yml

@@ -48,7 +48,7 @@ jobs:
       matrix:
         # List of the language-implementation API pairs to publish wheels for
         # The list of supported is obtainable by running `docker run quay.io/pypa/manylinux2014_x86_64 ls /opt/python`
-        PYTHON_IMPLEMENTATION_ABI: [cp35-cp35m, cp36-cp36m, cp37-cp37m, cp38-cp38]
+        PYTHON_IMPLEMENTATION_ABI: [cp35-cp35m, cp36-cp36m, cp37-cp37m, cp38-cp38, cp39-cp39]
     runs-on: ubuntu-latest
     container: quay.io/pypa/manylinux2014_x86_64  # Builds wheels on CentOS 7 (supported until 2024)
     env:

python/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Python 3.9 support.
+
 ### Changed
 
 - Links to remote stylesheets are deduplicated now.

python/setup.py

@@ -43,6 +43,7 @@ def call_setup():
             "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 :: Rust",
         ],

python/tox.ini

@@ -3,7 +3,7 @@
 # (workaround the fact that setup.py does not honor pyproject.toml)
 skipsdist = True
 
-envlist = py{35,36,37,38}
+envlist = py{35,36,37,38,39}
 
 [testenv]
 deps =