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Building with Meson

Developer build

Install the dev.py tool:

pip install -r requirements/developer.txt

Then build skimage:

./dev.py build
./dev.py test

To run a specific test:

./dev.py test -- skimage/io/tests/test_imageio.py

Or to try the new version in IPython:

./dev.py ipython

Run ./dev.py --help for more commands.

Developer build (explicit)

Install build tools: pip install -r requirements/build.txt

Generate ninja make files: meson build --prefix=$PWD/build

Compile: ninja -C build

Install: meson install -C build

The install step copies the necessary Python files into the build dir to form a complete package. Do not skip this step, or the package won't work.

To use the package, add it to your PYTHONPATH:

export PYTHONPATH=${PWD}/build/lib64/python3.10/site-packages
pytest --pyargs skimage

pip install

The standard installation procedure via pip still works:

pip install --no-build-isolation .

Note, however, that pip install -e . (in-place developer install) does not! See "Developer build" above.

sdist and wheel

The Python build module calls Meson and ninja as necessary to produce an sdist and a wheel:

python -m build --no-isolation

Notes

Templated Cython files

The skimage/morphology/skeletonize_3d.pyx.in is converted into a pyx file using Tempita. That pyx file appears in the build directory, and can be compiled from there.

If that file had to import local *.pyx files (it does not) then the build dependencies would need be set to ensure that the relevant pyx files are copied into the build directory prior to compilation (see _cython_tree in the SciPy Meson build files).