-r base.txt

pip-tools
coverage
flake8
flake8-builtins
flake8-commas
flake8-isort
flake8-mutable
flake8-polyfill
flake8-print; python_version >= '3.3'
isort
pytest
mock; python_version < '3'
tox
flake8-mypy; python_version >= '3.5'

flake8-bugbear; python_version >= '3'
flake8-comprehensions; python_version >= '3'
flake8-eradicate; python_version >= '3'
