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From: Scott Kitterman <debian@kitterman.com>
Newsgroups: linux.debian.maint.python
Subject: PEP-517/PEP-518 Support In Debian
Date: Mon, 13 Apr 2020 00:40:02 +0200
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This being roughly the mid-point in the development cycle, I thought it might 
be good to see where we are in terms of future Python packaging developments.

As I understand it, PEP-517 and PEP-518 are 'the future'.

I took a look at the presence of pyproject.toml files in the Debian archive.  
There are currently 99 packages.  Of those, only 28 specify a 'build-backend', 
which is required by 517/518 to be useful for building a package.

25 specify: build-backend = "setuptools.build_meta" (including setuptools)
3 specify: build-backend = "flit_core.buildapi" (including flit)

If build-backend is not specified, the build system has to fall back to 
setup.py.

I've recently package flit (just arrived in Testing) and written a flit plugin 
for pybuild that's pending review for merging[1].  I also packaged pep517 for 
our pip package, so that's available to support future Debian tool development 
in this area.

For the moment, I guess we are in reasonable shape, but it might be useful to 
have a pybuild plugin to use PEP517/setuptools.build_meta in lieu of setup.py 
with setuptools/distutils when available.  In the future, this will be the 
primary API and the sooner we start to use it, the better.

Scott K

[1] https://salsa.debian.org/python-team/tools/dh-python/-/merge_requests/12
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