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When pulling in a 3rd party requirement in a rule as a dependency how do I hydrate the full file sources? It seems if I pull in Sources for a 3rd party requirement I simply get back `requirements.txt`

Hello! Could you please clarify what you mean with hydrating the full file sources? Do you mean downloading/building the wheel for that requirement via pip/Pex from PyPI?

I've been banging my head reading through `pants.backend.python` and only just realized there's a `PythonSourceFilesRequest`  which is what I'm assuming is what I should be using?

Not quite - instead, check out `pex_from_targets.py`. You can use that out of the box to get the behavior you want, e.g. hooking up to `[python-setup].requirement_constraints` for you