Add support for Python 3.9

.github/workflows/test.yml

@@ -4,33 +4,24 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
         python-version: [3.5, 3.6, 3.7, 3.8, 3.9, pypy3]
-        os: [ubuntu-18.04]
 
     steps:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
 
-      - name: Set up Python ${{ matrix.python }} (deadsnakes)
-        uses: deadsnakes/action@v1.0.0
-        if: endsWith(matrix.python-version, '-dev')
-        with:
-          python-version: ${{ matrix.python-version }}
-
       - name: Set up Python ${{ matrix.python-version }}
-        if: "!endsWith(matrix.python-version, '-dev')"
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Ubuntu cache
-        uses: actions/cache@v1
-        if: startsWith(matrix.os, 'ubuntu')
+      - name: Cache
+        uses: actions/cache@v2
         with:
           path: ~/.cache/pip
           key:
@@ -47,12 +38,10 @@ jobs:
           python3 -m pip install ".[test]"
 
       - name: Tests
-        shell: bash
         run: |
           python -m testtools.run testtools.tests.test_suite
 
       - name: Docs
-        shell: bash
         run: |
           make clean-sphinx docs
 

NEWS

@@ -9,6 +9,9 @@ NEXT
 Improvements
 ------------
 
+* Add support for Python 3.9.
+  (Hugo van Kemenade)
+
 * The skip, skipIf, and skipUnless decorators can now be used as class
   decorators as well as test method decorators, just as they can in
   unittest.

scripts/all-pythons

@@ -89,5 +89,5 @@ def now():
 if __name__ == '__main__':
     sys.path.append(ROOT)
     result = TestProtocolClient(sys.stdout)
-    for version in '3.5 3.6 3.7 3.8'.split():
+    for version in '3.5 3.6 3.7 3.8 3.9'.split():
         run_for_python(version, result, sys.argv[1:])

setup.cfg

@@ -16,6 +16,7 @@ classifier =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy