When opening a new issue or commenting on an existing issue, please make sure to provide concise, detailed instructions on how to reproduce the issue. If the issue can't be reproduced, it will be closed. Clearly describe the results you're seeing, and the results you're expecting.
flake8 is the law of the land. The only flake8 rule ignored is W503. For more details on why W503 should be ignored, see this explanation, or this shorter explanation by Python expert Anthony Sottile.
For questions about this document, reach out to Michael Mintz.