2 build
=`nix-build -E "with import (fetchTarball "channel:nixpkgs-unstable") {}; python3.withPackages(ps: with ps; [ packaging requests toolz ])"`
3 python
=${build}/bin
/python
4 exec ${python} pkgs
/development
/interpreters
/python
/update-python-libraries
/update-python-libraries.py $@
