Ideally this problem should be solved with the Provides-Dist metadata.[1] The exact semantic to the flag is unfortunately not discussed much currently, and no installer implementations that I know of (including pip) support it at all.
This also recently came up in pip’s issue tracker,[2] and I guess this is as good a time as any to start the conversation if someone is willing to help drive that discussion forward. [1]: https://packaging.python.org/specifications/core-metadata/#provides-dist-multiple-use [2]: https://github.com/pypa/pip/issues/8669 -- Tzu-ping Chung (@uranusjr) uranu...@gmail.com https://uranusjr.com > On 03/8, 2020, at 05:59, Daniele Varrazzo <daniele.varra...@gmail.com> wrote: > > On Sun, 2 Aug 2020 at 21:34, Bert JW Regeer <xiste...@0x58.com> wrote: >> >> By splitting it into two different packages you end up with the same >> situation that currently plagues psycopg2/psycopg2-binary whereby if you >> depend on psycopg2 you can't easily swap in psycopg2-binary and vice-versa >> as the two don't satisfy the same dependency. > > The psycopg2 wheel or not wheel is the situation you describe, and > it's really suboptimal from the point of declaring dependencies: > beginners would like to use psycopg2-binary, but projects are advised > to depend on psycopg2, so they either don't get the wheel benefit or > they end up in a tangle of dependencies, two distributions installing > the same files, bad stuff. Offering the C distribution as an opt-in > extension would allow projects to depend only on the pure python > psycopg3, which would be also the right choice for beginners, and > allowing the grown-ups with a compiler to go faster by installing > psycopg3-c too, which wouldn't conflict with the basic package. > > >> Number 3 is kind of what sqlalchemy does, and then provide wheels for a huge >> variety of platforms to allow people to install the package without needing >> a compiler themselves. > > The difference in performance of the C extension is important enough > (15-20x - https://www.varrazzo.com/blog/2020/05/19/a-trip-into-optimisation/) > to arguably make or break a deal. If someone wanted the C extension > because they need the performance I wouldn't want its installation to > fail silently. > > > -- Daniele > -- > Distutils-SIG mailing list -- distutils-sig@python.org > To unsubscribe send an email to distutils-sig-le...@python.org > https://mail.python.org/mailman3/lists/distutils-sig.python.org/ > Message archived at > https://mail.python.org/archives/list/distutils-sig@python.org/message/MQNGT25XY3V7UDTKXVOEQ3XABLTEK4DS/
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