Python 3.10 compatibility (#1350)

Co-authored-by: Cyrille Pontvieux <cyrille@enialis.net>

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9"]
+        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10-dev"]
 
     steps:
     - uses: actions/checkout@v2

graphene/relay/connection.py

@@ -1,5 +1,11 @@
 import re
-from collections import Iterable, OrderedDict
+from collections import OrderedDict
+
+try:
+    from collections.abc import Iterable
+except ImportError:
+    from collections import Iterable
+
 from functools import partial
 
 from graphql_relay import connection_from_list

graphene/types/field.py

@@ -1,5 +1,11 @@
 import inspect
-from collections import Mapping, OrderedDict
+from collections import OrderedDict
+
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
+
 from functools import partial
 
 from .argument import Argument, to_arguments

graphene/utils/crunch.py

@@ -1,5 +1,9 @@
 import json
-from collections import Mapping
+
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
 
 
 def to_key(value):

graphene/utils/deduplicator.py

@@ -1,4 +1,9 @@
-from collections import Mapping, OrderedDict
+from collections import OrderedDict
+
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
 
 
 def deflate(node, index=None, path=None):

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,36,37,38,39},flake8,pre-commit,mypy
+envlist = py{27,36,37,38,39,310},flake8,pre-commit,mypy
 
 [gh-actions]
 python =
@@ -8,18 +8,19 @@ python =
     3.7: py37
     3.8: py38
     3.9: py39
+    3.10-dev: py310
 
 [testenv]
 passenv = *
 usedevelop = True
 deps =
     -e.[test]
-    py{36,37,38,39}: pytest-asyncio
+    py{36,37,38,39,310}: pytest-asyncio
 setenv =
      PYTHONPATH = .:{envdir}
 commands =
     py{27}: py.test --cov=graphene graphene examples {posargs}
-    py{36,37,38,39}: py.test --cov=graphene graphene examples tests_asyncio tests_py36 {posargs}
+    py{36,37,38,39,310}: py.test --cov=graphene graphene examples tests_asyncio tests_py36 {posargs}
 
 [testenv:pre-commit]
 deps =