Add mypy checks

.github/workflows/python-check.yml

@@ -25,12 +25,16 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install -r requirements.txt
-        python -m pip install flake8 pylint black
+        python -m pip install flake8 pylint black mypy
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=88 --statistics
+    - name: Type check with mypy
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        mypy pyhon/
     # - name: Analysing the code with pylint
     #   run: |
     #     pylint --max-line-length 88 $(git ls-files '*.py')