-r requirements.txt black==19.10b0 flake8==3.7.9 isort==5.4.2 mypy==0.770 flake8-bugbear==20.1.4 flake8-builtins==1.5.2 flake8-comprehensions==3.1.4 flake8-mutable==1.2.0 flake8-tuple==0.4.1