Add new extras_require: lint

setup.py

@@ -41,15 +41,18 @@ extras_require = {
     'docs': [
         'sphinxcontrib-websupport',
     ],
-    'test': [
-        'pytest < 5.3.3',
-        'pytest-cov',
-        'html5lib',
+    'lint': [
         'flake8>=3.5.0',
         'flake8-import-order',
         'mypy>=0.761',
         'docutils-stubs',
     ],
+    'test': [
+        'pytest < 5.3.3',
+        'pytest-cov',
+        'html5lib',
+        'typed_ast',  # for py35-37
+    ],
 }
 
 # Provide a "compile_catalog" command that also creates the translated

tox.ini

@@ -27,6 +27,8 @@ commands=
 basepython = python3
 description =
     Run style checks.
+extras =
+    lint
 commands =
     flake8
 
@@ -54,9 +56,8 @@ commands =
 basepython = python3
 description =
     Run type checks.
-deps =
-    mypy
-    docutils-stubs
+extras =
+    lint
 commands=
     mypy sphinx/