vagrant-cachier-ng/docs/buckets/pip.md

pip

Compatible with probably any type of linux guest distro, will hook into pip's http and wheels cache directory under $HOME/.cache/pip/http and $HOME/.cache/pip/wheels as the default SSH user (usually vagrant) on your guest.

To manually enable it:

Vagrant.configure("2") do |config|
  config.vm.box = 'some-box-with-pip-installed'
  config.cache.enable :pip
end