Brought to you by the same guy who made “requests - HTTP for humans”, this is a Python package / virtual environment manager recommended by python.org that actually makes since. It removes the requirements.txt file in favor of the dependencies/lockfile pattern every other language uses, as well as the need to create / manage a virtual environment by doing it all automatically for you.
This is a neat tool. I catch myself getting confused with venvs on a bunch of the tildes installing pip packages without root.