PEP 660 – Editable installs for pyproject.toml based builds defines how to build projects that only use pyproject.toml. Build tools must implement PEP 660 for editable installs to work. You need a front-end (such as pip ≥ 21.3) and a backend. The statuses of some popular backends are:
- Setuptools implements PEP 660 as of version 64.
- Flit implements PEP 660 as of version 3.4.
- Poetry implements PEP 660 as of version 1.0.8.
Note: To be able to do an editable installation to your user site (pip install -e --user), you need a system installed setuptools v62.0.0 or newer.