code cleanup in step function

1 job for master in 1 minute and 54 seconds (queued for 1 second)
Name Stage Failure
failed
tests Test
coverage html
python -c "$BROWSER_PYSCRIPT" htmlcov/index.html
___________________________________ summary ____________________________________
py36: commands succeeded
py37: commands succeeded
ERROR: flake8: commands failed
docs: commands succeeded
coverage: commands succeeded
ERROR: Job failed: command terminated with exit code 1