drop py36; add py39 (#495)

Fixes #494

Author: escapewindow

.taskcluster.yml

@@ -28,7 +28,7 @@ tasks:
     }
   in:
     # map tox command -> docker image
-    $map: [['py36', 'python:3.6', {NO_TESTS_OVER_WIRE: '1'}, []],
+    $map: [
            ['py37', 'python:3.7', {
                 NO_TESTS_OVER_WIRE: '1',
                 TRAVIS_JOB_ID: '${as_slugid("py37")}',
@@ -37,12 +37,16 @@ tasks:
            # Disabled due to legitimate failures.
            # See https://github.com/mozilla-releng/scriptworker/issues/415
            ['py38', 'python:3.8', {NO_TESTS_OVER_WIRE: '1'}, []],
+           ['py39', 'python:3.9', {NO_TESTS_OVER_WIRE: '1'}, []],
            ['py37-cot', 'python:3.7', {
                 NO_CREDENTIALS_TESTS: '1'
             }, ['secrets:get:repo:github.com/mozilla-releng/scriptworker:github']],
            ['py38-cot', 'python:3.8', {
                 NO_CREDENTIALS_TESTS: '1',
             }, ['secrets:get:repo:github.com/mozilla-releng/scriptworker:github']],
+           ['py39-cot', 'python:3.9', {
+                NO_CREDENTIALS_TESTS: '1',
+            }, ['secrets:get:repo:github.com/mozilla-releng/scriptworker:github']],
            ['lint', 'python:3.7', {}, []],
            ['mypy', 'python:3.7', {}, []]]
     each(py):

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 160
-target-version = ["py36", "py37", "py38"]
+target-version = ["py37", "py38"]
 include = '\.(wsgi|pyi?)$'
 exclude = '''
 /(

setup.py

@@ -93,13 +93,13 @@ def run_tests(self):
     license="MPL 2.0",
     install_requires=install_requires,
     tests_require=tests_require,
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     cmdclass={"test": Tox},
     classifiers=(
         "Intended Audience :: Developers",
         "Natural Language :: English",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ),
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = lint,mypy,py36,py37,py37-cot,py38,py38-cot
+envlist = lint,mypy,py37,py37-cot,py38,py38-cot,py39,py39-cot
 
 [testenv]
 depends = clean
@@ -72,6 +72,11 @@ commands=
     python setup.py develop
     py.test -k test_verify_production_cot --random-order-bucket=none
 
+[testenv:py39-cot]
+commands=
+    python setup.py develop
+    py.test -k test_verify_production_cot --random-order-bucket=none
+
 [testenv:lint]
 skip_install = true
 deps =