added mypy to CI tests

.github/workflows/ci-cd.yml

@@ -23,6 +23,8 @@ jobs:
     defaults:
       run:
         shell: bash -l {0}
+    env:
+      PIP_BREAK_SYSTEM_PACKAGES: 1
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -42,6 +44,8 @@ jobs:
       run: python3 -m pip install --upgrade pip
     - name: Install Package
       run: python3 -m pip install -e .[test] -e ./extras[test]
+    - name: MyPy
+      run: mypy --install-types --non-interactive .
     - name: Pytest
       run: pytest -vvs --cov fileformats --cov-config .coveragerc --cov-report xml .
     - name: Upload coverage to Codecov

pyproject.toml

@@ -7,20 +7,11 @@ name = "fileformats-CHANGEME"
 description = "Classes for representing different file formats in Python classes for use in type hinting in data workflows"
 readme = "README.rst"
 requires-python = ">=3.8"
-dependencies = [
-    "fileformats >= 0.4"
-]
-license = {file = "LICENSE"}
-authors = [
-    {name = "<YOUR-NAME>", email = "<YOUR-EMAIL>"},
-]
-maintainers = [
-    {name = "<YOUR-NAME>", email = "<YOUR-EMAIL>"},
-]
-keywords = [
-    "file formats",
-    "data",
-]
+dependencies = ["fileformats >= 0.4"]
+license = { file = "LICENSE" }
+authors = [{ name = "<YOUR-NAME>", email = "<YOUR-EMAIL>" }]
+maintainers = [{ name = "<YOUR-NAME>", email = "<YOUR-EMAIL>" }]
+keywords = ["file formats", "data"]
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Environment :: Console",
@@ -38,18 +29,13 @@ classifiers = [
 dynamic = ["version"]
 
 [project.optional-dependencies]
-dev = [
-    "black",
-    "pre-commit",
-    "codespell",
-    "flake8",
-    "flake8-pyproject",
-]
+dev = ["black", "pre-commit", "codespell", "flake8", "flake8-pyproject"]
 test = [
     "pytest >=6.2.5",
     "pytest-env>=0.6.2",
     "pytest-cov>=2.12.1",
     "codecov",
+    "mypy >=1.5.1",
 ]
 
 [project.urls]
@@ -73,9 +59,15 @@ ignore-words = ".codespell-ignorewords"
 
 [tool.flake8]
 doctests = true
-per-file-ignores = [
-    "__init__.py:F401"
-]
+per-file-ignores = ["__init__.py:F401"]
 max-line-length = 88
 select = "C,E,F,W,B,B950"
 extend-ignore = ['E203', 'E501', 'E129']
+
+[tool.mypy]
+python_version = "3.8"
+ignore_missing_imports = true
+strict = true
+namespace_packages = true
+explicit_package_bases = true
+exclude = ["tests", "build", "dist"]