Add support for Python 3.10

.github/workflows/main.yml

@@ -27,13 +27,16 @@ jobs:
           "windows-py37",
           "windows-py37-pluggy",
           "windows-py38",
+          "windows-py39",
+          "windows-py310",
 
           "ubuntu-py36",
           "ubuntu-py37",
           "ubuntu-py37-pluggy",
           "ubuntu-py37-freeze",
           "ubuntu-py38",
           "ubuntu-py39",
+          "ubuntu-py310",
           "ubuntu-pypy3",
 
           "macos-py37",
@@ -62,6 +65,14 @@ jobs:
             os: windows-latest
             tox_env: "py38-unittestextras"
             use_coverage: true
+          - name: "windows-py39"
+            python: "3.9"
+            os: windows-latest
+            tox_env: "py39-xdist"
+          - name: "windows-py310"
+            python: "3.10-dev"
+            os: windows-latest
+            tox_env: "py310-xdist"
 
           - name: "ubuntu-py36"
             python: "3.6"
@@ -88,6 +99,10 @@ jobs:
             python: "3.9"
             os: ubuntu-latest
             tox_env: "py39-xdist"
+          - name: "ubuntu-py310"
+            python: "3.10-dev"
+            os: ubuntu-latest
+            tox_env: "py310-xdist"
           - name: "ubuntu-pypy3"
             python: "pypy-3.7"
             os: ubuntu-latest

.pre-commit-config.yaml

@@ -42,6 +42,7 @@ repos:
     rev: v1.17.0
     hooks:
     -   id: setup-cfg-fmt
+        args: [--max-py-version=3.10]
 -   repo: https://github.com/pre-commit/pygrep-hooks
     rev: v1.8.0
     hooks:

changelog/8494.feature.rst

@@ -0,0 +1 @@
+Python 3.10 is now supported.

pyproject.toml

@@ -26,6 +26,8 @@ filterwarnings = [
     # produced by older pyparsing<=2.2.0.
     "default:Using or importing the ABCs:DeprecationWarning:pyparsing.*",
     "default:the imp module is deprecated in favour of importlib:DeprecationWarning:nose.*",
+    # distutils is deprecated in 3.10, scheduled for removal in 3.12
+    "ignore:The distutils package is deprecated:DeprecationWarning",
     # produced by python3.6/site.py itself (3.6.7 on Travis, could not trigger it with 3.6.8)."
     "ignore:.*U.*mode is deprecated:DeprecationWarning:(?!(pytest|_pytest))",
     # produced by pytest-xdist

setup.cfg

@@ -21,6 +21,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Topic :: Software Development :: Libraries
     Topic :: Software Development :: Testing
     Topic :: Utilities

testing/test_skipping.py

@@ -876,7 +876,8 @@ def test_hello():
         result = pytester.runpytest()
         result.stdout.fnmatch_lines(
             [
-                "*TypeError: __init__() got multiple values for argument 'reason' - maybe you meant pytest.mark.skipif?"
+                "*TypeError: *__init__() got multiple values for argument 'reason'"
+                " - maybe you meant pytest.mark.skipif?"
             ]
         )
 

tox.ini

@@ -8,6 +8,7 @@ envlist =
     py37
     py38
     py39
+    py310
     pypy3
     py37-{pexpect,xdist,unittestextras,numpy,pluggymain}
     doctesting