Add mypy to the build

Author: bringhurst

.github/workflows/testing.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Code check
         run: tox -e ${TOX_VENV}
         env:
-          TOX_VENV: black,pep8
+          TOX_VENV: black,pep8,mypy
 
   test:
     needs: [validate]

mypy.ini

@@ -0,0 +1,51 @@
+[mypy]
+
+# TODO: For details on each flag, please see the mypy documentation at:
+# https://mypy.readthedocs.io/en/stable/config_file.html#config-file
+
+# Import Discovery
+namespace_packages = false
+# FIXME: disable ignore_missing_imports
+ignore_missing_imports = true
+# FIXME: remove excludes
+exclude = ['tests/']
+
+# Disallow dynamic typing
+# FIXME: enable disallow_any_generics
+disallow_any_generics = false
+disallow_subclassing_any = true
+
+# Untyped definitions and calls
+# FIXME: enable disallow_untyped_calls
+disallow_untyped_calls = false
+# FIXME: enable disallow_untyped_defs
+disallow_untyped_defs = false
+disallow_incomplete_defs = true
+# FIXME: enable check_untyped_defs
+check_untyped_defs = false
+disallow_untyped_decorators = true
+
+# None and Optional handling
+no_implicit_optional = true
+
+# Configuring warnings
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_no_return = true
+warn_return_any = true
+warn_unreachable = true
+
+# Miscellaneous strictness flags
+implicit_reexport = false
+strict_equality = true
+
+# Configuring error messages
+show_error_context = true
+show_column_numbers = true
+show_error_codes = true
+pretty = true
+show_absolute_path = true
+
+# Miscellaneous
+warn_unused_configs = true
+verbosity = 0

pyproject.toml

@@ -3,7 +3,6 @@ build-backend = 'setuptools.build_meta'
 requires = [
     'setuptools >= 46.4.0',
 ]
-
 [tool.black]
 line-length = 79
 target-version = ['py37', 'py38', 'py39', 'py310']

setup.cfg

@@ -73,11 +73,14 @@ sasl =
 docs =
     Sphinx>=1.2.2
 
+typing =
+    mypy>=0.991
+
 alldeps =
     %(dev)s
     %(eventlet)s
     %(gevent)s
     %(sasl)s
     %(docs)s
-
+    %(typing)s
 

tox.ini

@@ -4,7 +4,7 @@ requires=
     virtualenv>=20.7.2
 skip_missing_interpreters=True
 envlist =
-    pep8,black,
+    pep8,black,mypy,
     gevent,eventlet,sasl,
     docs,
     pypy3
@@ -59,3 +59,10 @@ deps =
 usedevelop = True
 commands = black --check {posargs: {toxinidir}/kazoo {toxinidir}/kazoo}
 
+[testenv:mypy]
+basepython = python3
+extras = alldeps
+deps =
+    mypy
+usedevelop = True
+commands = mypy --config-file {toxinidir}/mypy.ini -p kazoo