freebsd/11.1 python=2.7,3.6 python_dir=/usr/local/bin
freebsd/12.0 python=3.6,2.7 python_dir=/usr/local/bin
osx/10.11 python=2.7 python_dir=/usr/local/bin
rhel/7.6 python=2.7
rhel/8.1 python=3.6