Switch to flake8

pylint no longer works on MacOSX

.azure-pipelines/prepare-env.yml

@@ -14,7 +14,7 @@ steps:
     python -m pip install pytest
     python -m pip install pytest-asyncio
     python -m pip install Sphinx
-    python -m pip install pylint
+    python -m pip install flake8
   displayName: Prepare general environment
   condition: |
     and(

.azure-pipelines/run-tests.yml

@@ -18,8 +18,8 @@ jobs:
       coverage run -m pytest --junitxml=junit/test-results.xml tests
       coverage xml
     displayName: 'Test with pytest'
-  - bash: ./pylint
-    displayName: pylint
+  - bash: ./flake8
+    displayName: flake8
   - task: PublishTestResults@2
     condition: succeededOrFailed()
     inputs:

.flake8

@@ -0,0 +1,5 @@
+[flake8]
+
+max-line-length=100
+select=E,F,W
+ignore=W503