Example requirements.txt requested: --- I'm stress testing a new lockfile generation feature in Pex that Pants will be using as a first major customer and I'd like your help. The Python package ecosystem is pretty wild! See here and here for some pretty funky things I've already run across and handled. Pex strives to handle the Python packaging ecosystem in its entirety since its not fun to have someone else's problems affect your project / workflow / day. If any of you can provide requirements files that you think might be hairy and that just use PyPI, please attach them here and I'll see if Pex can handle locking them. Thanks in advance!