1[build-system] 2requires = [ 3 # The minimum setuptools version is specific to the PEP 517 backend, 4 # and may be stricter than the version required in `setup.py` 5 "setuptools>=40.6.0", 6 "wheel", 7 # Must be kept in sync with the `setup_requirements` in `setup.py` 8 "cffi>=1.12; platform_python_implementation != 'PyPy'", 9] 10build-backend = "setuptools.build_meta" 11 12[tool.black] 13line-length = 79 14target-version = ["py27"] 15