Flit is itself packaged using Flit, as are some foundational packaging tools
pep517. So where can you start if you need to install everything
For most users,
pip handles all this automatically. You should only need
to deal with this if you’re building things entirely from scratch, such as
putting Python packages into another package format.
The key piece is
flit_core. This is a package which can build itself using
nothing except Python and the standard library. From an unpacked source archive,
you can make a wheel by running:
python -m flit_core.wheel
And then you can install this wheel with the
included in the sdist (or by unzipping it to the correct directory):
# Install to site-packages for this Python:
python bootstrap_install.py dist/flit_core-*.whl
# Install somewhere else:
python bootstrap_install.py --installdir /path/to/site-packages dist/flit_core-*.whl
As of version 3.6, flit_core bundles the
tomli TOML parser, to avoid a
dependency cycle. If you need to unbundle it, you will need to special-case
installing flit_core and/or tomli to get around that cycle.
flit_core, I recommend that you get installer set up. You can use
python -m flit_core.wheel again to make a wheel, and then use installer
itself (from the source directory) to install it.
After that, you probably want to get build
and its dependencies installed as the goal of the bootstrapping phase. You can
build to create wheels of any other Python packages, and
installer to install them.