[joshmaker]

Two features I miss from pip-tools:

1. `pip-sync`, An easy way to ensure my local environment actually matches my defined requirements. I guess the pipenv version of this would be `pipenv uninstall --all && pipenv install` which isn't quite as elegant, but perhaps good enough.

2. The ability to create more than two requirement sets. For my projects it's often handy to three sets of requirements:

• Normal production requirements end users will need to run the app

• CI requirements needed for testing, but not running the app in production (Selenium, Flake8, etc)

• Local debugging tools (ipython, ipdb)

I could include my local debugging tools in the `--dev` requirements, but then I'm unnecessarily making my CI builds slower by adding requirements for packages that should never actually be referenced in committed code. Alternatively, I could leave them out of my dependencies entirely, but then I have to remember to reinstall them every time I sync my local env to ensure it matches the piplock file.

[cmcginty]

  pip-compile --upgrade
  pip-compile --upgrade-package

are also necessary features to quickly track your dependencies (and transitive deps).

pipenv uses pip-tools, but they haven't exposed these features as far as I can tell.