A recent change of flake8 or its config causes the code style check to fail on the master branch - it complains about a ambiguous variable name in few files:

tests/unit/v1/test_order.py:210:16: E741 ambiguous variable name 'l'
tests/unit/v1beta1/test_order.py:210:16: E741 ambiguous variable name 'l'

/cc @crwilcox