#17805 Hook up python_requirements and pyproject.toml to tailor Issue created by bryanwweber Is your feature request related to a problem? Please describe. PR #16932 added a PEP 621 parser for `python_requirement`s coming from a

pyproject.toml

file. At the moment, users must explicitly give the source as

pyproject.toml

since there's only logic to search for

requirements.txt

files as the source. In the PR, @Eric-Arellano suggested that I open an issue to track automatically adding

pyproject.toml

as the source of the

python_requirements

target when it makes sense to do so. Describe the solution you'd like If I specify a

python_requirements

target, and there is no

requirements.txt

file present, I would like pantsbuild to automatically add

pyproject.toml

as the source file, presuming one exists. Describe alternatives you've considered The alternative, which works currently, is to manually add

pyproject.toml

as the `source. pantsbuild/pants