$ bash flake8-run.sh
html5lib/sanitizer.py:248:24: E713 test for membership should be 'not in'
html5lib/treebuilders/dom.py:161:24: E713 test for membership should be 'not in'
html5lib/tests/test_tokenizer.py:71:12: E713 test for membership should be 'not in'
html5lib/tests/test_tokenizer.py:72:34: E713 test for membership should be 'not in'
html5lib/tests/test_tokenizer.py:115:40: E128 continuation line under-indented for visual indent
html5lib/serializer/htmlserializer.py:38:16: E713 test for membership should be 'not in'
html5lib/serializer/htmlserializer.py:294:20: E713 test for membership should be 'not in'