[Numpy-discussion] Is the build-system section of pyproject.toml a maintained list of the build dependencies?

Kevin Sheppard kevin.k.sheppard at gmail.com
Wed Jan 8 11:43:25 EST 2020

With recent versions of pip it will read the pyproject.toml file to get the
dependencies, and then install these in an isolated environment to build
the wheel, and then install the wheel.  The requires=[...] in the pyproject
is not installed in the original environment, so that when run on NumPy,
you would only end up with NumPy installed. Are you trying to get Cython
installed after an install of NumPy?  If you want this then it needs to be
listed in the setup as a dependency.

On Wed, Jan 8, 2020 at 4:38 PM Warren Weckesser <warren.weckesser at gmail.com>

> On 1/8/20, Warren Weckesser <warren.weckesser at gmail.com> wrote:
> > I'm doing some work on the travis-ci scripts, and I'd like to remove
> > some redundant calls of 'pip install'.  The scripts should get the
> > build dependencies from a configuration file instead of having
> > hard-coded pip commands.  Is pyproject.toml the appropriate file to
> > use for this?  (Note: we also have test_requirements.txt, but as the
> > name says, those are the dependencies for running the tests, not for
> > building numpy.)
> >
> Updating my question:  `pyproject.toml` lists numpy's build
> dependencies in the `build_system` section of the file:
> [build-system]
> # Minimum requirements for the build system to execute.
> requires = [
>     "setuptools",
>     "wheel",
>     "Cython>=0.29.14",  # Note: keep in sync with tools/cythonize.py
> ]
> So the file serves the equivalent purpose of a `requirements.txt`
> file.  Is there an option to pip that would allow something like
>     pip install -r pyproject.toml
> (with some other flag or option as needed) to install the build
> requirements found in pyproject.toml?  In
> https://github.com/numpy/numpy/pull/15275, I wrote a few lines of
> Python to get the dependencies from pyproject.toml, but it seems like
> that shouldn't be necessary.
> Warren
> > Warren
> >
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