Lint Python code during CI run (#33)

Use flake8 to check:

- Formatting compliance with PEP 8

- Code style consistency

- Cyclomatic complexity

A configuration file is provided to assist contributors with verifying compliance locally.

Author: per1234

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+doctests = True
+# W503 and W504 are mutually exclusive. PEP 8 recommends line break before.
+ignore = W503
+max-complexity = 10
+max-line-length = 120
+select = E,W,F,C,N

.github/workflows/libraries_report-size-deltas.yml

@@ -15,6 +15,12 @@ jobs:
         with:
           python-version: '3.8.2'
 
+      - name: Lint with flake8
+        run: |
+          pip install --quiet flake8
+          pip install --quiet pep8-naming
+          flake8 --show-source "$GITHUB_WORKSPACE/libraries/report-size-deltas"
+
       - name: Run Python unit tests
         run: |
           export PYTHONPATH="$GITHUB_WORKSPACE/libraries/report-size-deltas"