Add mypy pre-commit hook (#136)

* Add mypy pre-commit hook

* Change precommit default python version to 3.7

* Remove python 3.6 from build matrix

* Add types-PyYAML to mypy hook requiments

* Fix type hints

* Update setup.py (remove python 3.6)

.github/workflows/main.yml

@@ -10,11 +10,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        tox_env: ["py36", "py37", "py38", "py39", "py310"]
+        tox_env: ["py37", "py38", "py39", "py310"]
         os: [ubuntu-latest, windows-latest]
         include:
-          - tox_env: "py36"
-            python: "3.6"
           - tox_env: "py37"
             python: "3.7"
           - tox_env: "py38"

.pre-commit-config.yaml

@@ -1,5 +1,5 @@
 default_language_version:
-    python: python3.6
+    python: python3.7
 repos:
   - repo: https://github.com/psf/black
     rev: 22.1.0
@@ -11,6 +11,11 @@ repos:
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.931
+    hooks:
+      - id: mypy
+        additional_dependencies: [types-PyYAML]
   - repo: local
     hooks:
       - id: rst

docs/conf.py

@@ -15,6 +15,7 @@
 
 import sys
 import os
+from typing import Dict
 
 # If extensions (or modules to document with autodoc) are in another
 # directory, add these directories to sys.path here. If the directory is
@@ -193,7 +194,7 @@
 
 # -- Options for LaTeX output ------------------------------------------
 
-latex_elements = {
+latex_elements: Dict[str, str] = {
     # The paper size ('letterpaper' or 'a4paper').
     #'papersize': 'letterpaper',
     # The font size ('10pt', '11pt' or '12pt').

setup.py

@@ -47,7 +47,6 @@
         "License :: OSI Approved :: MIT License",
         "Natural Language :: English",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",