Test against Django 3.2 prerelease

* Omit default_app_config under Django 3.2 and later
  to avoid DeprecationWarning
* Also adds testing on Python 3.9, 3.10-alpha
* Also updates test matrix to include all supported
  Python versions (some older Django versions expanded
  Python support in patch releases)

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - { tox: "lint,docs", python: 3.8 }
+          - { tox: "lint,docs", python: "3.8" }
 
           # Anymail supports the same Python versions as Django, plus PyPy.
           # https://docs.djangoproject.com/en/dev/faq/install/#what-python-version-can-i-use-with-django
@@ -27,36 +27,49 @@ jobs:
           # combinations, to avoid rapidly consuming the testing accounts' entire send allotments.
 
           # Django 2.0: Python 3.5+
-          - { tox: django20-py35-all, python: 3.5 }
+          - { tox: django20-py35-all, python: "3.5" }
-          - { tox: django20-py36-all, python: 3.6 }
+          - { tox: django20-py36-all, python: "3.6" }
-          - { tox: django20-pypy3-all, python: pypy3 }
+          - { tox: django20-pypy3-all, python: "pypy3" }
           # Django 2.1: Python 3.5, 3.6, or 3.7
-          - { tox: django21-py35-all, python: 3.5 }
+          - { tox: django21-py35-all, python: "3.5" }
-          - { tox: django21-py36-all, python: 3.6 }
+          - { tox: django21-py36-all, python: "3.6" }
-          - { tox: django21-py37-all, python: 3.7 }
+          - { tox: django21-py37-all, python: "3.7" }
           - { tox: django21-pypy3-all, python: pypy3 }
-          # Django 2.2: Python 3.5, 3.6, or 3.7
+          # Django 2.2: Python 3.5, 3.6, 3.7, 3.8 (added in 2.2.8), 3.9 (added in 2.2.17)
-          - { tox: django22-py35-all, python: 3.5 }
+          - { tox: django22-py35-all, python: "3.5" }
-          - { tox: django22-py36-all, python: 3.6 }
+          - { tox: django22-py36-all, python: "3.6" }
-          - { tox: django22-py37-all, python: 3.7 }
+          - { tox: django22-py37-all, python: "3.7" }
-          - { tox: django22-pypy3-all, python: pypy3 }
+          - { tox: django22-py38-all, python: "3.8" }
-          # Django 3.0: Python 3.6, 3.7, or 3.8
+          - { tox: django22-py39-all, python: "3.9" }
-          - { tox: django30-py36-all, python: 3.6 }
+          - { tox: django22-pypy3-all, python: "pypy3" }
-          - { tox: django30-py37-all, python: 3.7 }
+          # Django 3.0: Python 3.6, 3.7, 3.8, 3.9 (added in 3.0.11)
-          - { tox: django30-py38-all, python: 3.8 }
+          - { tox: django30-py36-all, python: "3.6" }
-          - { tox: django30-pypy3-all, python: pypy3 }
+          - { tox: django30-py37-all, python: "3.7" }
-          # Django 3.1: Python 3.6, 3.7, or 3.8
+          - { tox: django30-py38-all, python: "3.8" }
-          - { tox: django31-py36-all, python: 3.6 }
+          - { tox: django30-py39-all, python: "3.9" }
-          - { tox: django31-py37-all, python: 3.7 }
+          - { tox: django30-pypy3-all, python: "pypy3" }
-          - { tox: django31-py38-all, python: 3.8, options: run-live-tests }
+          # Django 3.1: Python 3.6, 3.7, 3.8, 3.9 (added in 3.1.3)
-          - { tox: django31-pypy3-all, python: pypy3 }
+          - { tox: django31-py36-all, python: "3.6" }
+          - { tox: django31-py37-all, python: "3.7" }
+          - { tox: django31-py38-all, python: "3.8", options: run-live-tests }
+          - { tox: django31-py39-all, python: "3.9" }
+          - { tox: django31-pypy3-all, python: "pypy3" }
+          # Django 3.2: Python 3.6, 3.7, 3.8, 3.9
+          - { tox: django32-py36-all, python: "3.6" }
+          - { tox: django32-py37-all, python: "3.7" }
+          - { tox: django32-py38-all, python: "3.8" }
+          - { tox: django32-py39-all, python: "3.9" }
+          - { tox: django32-pypy3-all, python: "pypy3" }
+          # Django 4.0: Python 3.8, 3.9, 3.10
           # Django current development (direct from GitHub source)
-          - { tox: djangoDev-py37-all, python: 3.7, options: allow-failures }
+          - { tox: djangoDev-py38-all, python: "3.8", options: allow-failures }
+          - { tox: djangoDev-py39-all, python: "3.9", options: allow-failures }
+          - { tox: djangoDev-py310-all, python: "3.10.0-alpha - 3.10", options: allow-failures }
           # Install without optional extras (don't need to cover entire matrix)
-          - { tox: django31-py37-none, python: 3.7 }
+          - { tox: django31-py37-none, python: "3.7" }
-          - { tox: django31-py37-amazon_ses, python: 3.7 }
+          - { tox: django31-py37-amazon_ses, python: "3.7" }
           # Test some specific older package versions
-          - { tox: django22-py37-all-old_urllib3, python: 3.7 }
+          - { tox: django22-py37-all-old_urllib3, python: "3.7" }
 
     steps:
       - name: Get code

CHANGELOG.rst

@@ -40,6 +40,8 @@ Fixes
 Other
 ~~~~~
 
+* Test against Django 3.2 prerelease (including support for Python 3.9)
+
 * Move CI testing to GitHub Actions (and stop using Travis-CI).
 
 * Internal: catch invalid recipient status earlier in ESP response parsing

anymail/__init__.py

@@ -2,4 +2,6 @@
 from ._version import __version__, VERSION  # NOQA: F401
 
 
+from django import VERSION as DJANGO_VERSION
+if DJANGO_VERSION < (3, 2, 0):
     default_app_config = 'anymail.apps.AnymailBaseConfig'

tests/test_settings/settings_4_0.py

@@ -0,0 +1,121 @@
+"""
+Django settings for Anymail tests.
+
+Generated by 'django-admin startproject' using Django 3.1.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/dev/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/dev/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/dev/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'NOT_FOR_PRODUCTION_USE'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'anymail',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'tests.test_settings.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'tests.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/dev/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/dev/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/dev/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/dev/howto/static-files/
+
+STATIC_URL = '/static/'

tox.ini

@@ -3,17 +3,18 @@ envlist =
     # Factors: django-python-extras
     # Test these environments first, to catch most errors early...
     lint
-    django31-py38-all
+    django31-py39-all
     django20-py35-all
     docs
     # ... then test all the other supported combinations:
-    django31-py{36,37,py3}-all
+    django31-py{36,37,38,py3}-all
-    django30-py{36,37,38,py3}-all
+    django30-py{36,37,38,39,py3}-all
-    django22-py{35,36,37,py3}-all
+    django22-py{35,36,37,38,39,py3}-all
     django21-py{35,36,37,py3}-all
     django20-py{36,py3}-all
     # ... then prereleases (if available):
-    djangoDev-py{36,37,38}-all
+    django32-py{36,37,38,39,py3}-all
+    djangoDev-py{38,39,310,py3}-all
     # ... then partial installation (limit extras):
     django31-py37-{none,amazon_ses}
     # ... then older versions of some dependencies:
@@ -25,7 +26,8 @@ deps =
     django21: django~=2.1.0
     django22: django~=2.2.0
     django30: django~=3.0.0
-    django31: django>=3.1rc1
+    django31: django~=3.1.0
+    django32: django>=3.2a1
     djangoDev: https://github.com/django/django/tarball/master
     old_urllib3: urllib3<1.25
     # testing dependencies (duplicates setup.py tests_require, less optional extras):