With PEP-518 being 5 years old it's still relatively new, and most tools have implemented the support for it relatively recently. The key introduction article w

With PEP-518 being 5 years old it's still relatively new, and most tools have implemented the support for it relatively recently. The key introduction article was written exactly one year ago: https://snarky.ca/what-the-heck-is-pyproject-toml/ https://snarky.ca/what-the-heck-is-pyproject-toml/