Add code style checker CI (#321)

Add code style checker CI

.github/workflows/pythonpackage.yml

@@ -21,17 +21,12 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt
-    - name: Lint with flake8
-      run: |
-        pip install flake8
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: install coverage
       run: pip install coverage
     - name: install mypy
       run: pip install mypy
+    - name: install pycodestyle
+      run: pip install pycodestyle
     - name: mypy check
       run: |
         find AerialNavigation -name "*.py" | xargs mypy
@@ -43,7 +38,10 @@ jobs:
         find PathPlanning -name "*.py" | xargs mypy
         find PathTracking -name "*.py" | xargs mypy
         find SLAM -name "*.py" | xargs mypy
+    - name: do diff style check
+      run: bash rundiffstylecheck.sh
     - name: do all unit tests
       run: bash runtests.sh
 
 
+