Change mypy and lint github steps to use nox/invoke to make CI validation configuration/commands match developer local commands.

Author: anselor

.github/workflows/lint.yml

@@ -23,6 +23,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install python prerequisites
-        run: pip install -U --user pip setuptools setuptools-scm flake8
+        run: pip install -U --user pip setuptools setuptools-scm nox
       - name: Lint
-        run: python -m flake8 .
+        run: python -m nox --non-interactive --session validate-${{ matrix.python-version }} -k flake8

.github/workflows/mypy.yml

@@ -23,6 +23,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install python prerequisites
-        run: pip install -U --user pip setuptools setuptools-scm mypy
+        run: pip install -U --user pip setuptools setuptools-scm nox
       - name: MyPy
-        run: python -m mypy cmd2
+        run: python -m nox --non-interactive --session validate-${{ matrix.python-version }} -k mypy  # Run nox for mypy

noxfile.py

@@ -39,3 +39,10 @@ def tests(session, plugin):
             '--no-pty',
             '--append-cov',
         )
+
+
+@nox.session(python=['3.8', '3.9'])
+@nox.parametrize('step', ['mypy', 'flake8'])
+def validate(session, step):
+    session.install('invoke', './[validate]')
+    session.run('invoke', step)

setup.py

@@ -66,19 +66,24 @@
     ],
     # development only dependencies:  install with 'pip install -e .[dev]'
     'dev': [
-        "pytest>=4.6",
         'codecov',
+        'doc8',
+        'flake8',
+        'invoke',
+        'mypy==0.902',
+        'nox',
+        "pytest>=4.6",
         'pytest-cov',
         'pytest-mock',
-        'nox',
-        'flake8',
         'sphinx',
         'sphinx-rtd-theme',
         'sphinx-autobuild',
-        'doc8',
-        'invoke',
         'twine>=1.11',
     ],
+    'validate': [
+        'flake8',
+        'mypy==0.902',
+    ],
 }
 
 PACKAGE_DATA = {