This method predates Python's standardized `pyproject.toml` build system,
introduced in PEP 517 to allow for more build backends than just
`setuptools`: https://peps.python.org/pep-0517/. Directly executing
`setup.py` has since been deprecated in favor of using PEP 517 compliant
installers, such as `pip`: https://packaging.python.org/en/latest/discussions/setup-py-deprecated/
In homebrew/core, our last remaining use is a single disabled formula.
For third party taps, simply migrate to `std_pip_args`:
```ruby
# Old
system python3, *Language::Python.setup_install_args(libexec, python3)
# New
system python3, "-m", "pip", "install", *std_pip_args, "."
```
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