requirements.txt

--extra-index-url https://antocuni.github.io/pypy-wheels/manylinux2010/
numpy; platform_python_implementation!="PyPy" or sys_platform!="darwin" or python_version<"3.0"
numpy<1.19; platform_python_implementation=="PyPy" and sys_platform=="darwin" and python_version>="3.0"
pytest
scipy; (platform_python_implementation!="PyPy" or sys_platform!="darwin") and python_version<"3.9"