Hey all, You may have seen some hub hub around psycopg2 and no longer shipping binary wheels by default [1][2] (and in fact using psycopg2-binary if you want wheels), and I wanted to bring it up here because it demonstrates a problem area with the current state of packaging in Python:
There is no good way for a new package to specify that it provides what another package would provide, and setuptools currently checks that all distributions are found before running the console scripts (so if a console script has a setup.py that depends on psycopg2 and you install psycopg2-binary it fails) [3] So currently if you pip install psycopg2-binary and then install a project that uses psycopg2 as a dependency it will install psycopg2 over top of psycopg2-binary. The author of psycopg2 stopped distributing binaries for psycopg2 because of issues with the version of SSL that Python was compiled for/what was used by psycopg2 and it causing all kinds of issues. I don't have a proposal or a fix, but this is going to be an issue not just for psycopg2 but also for other projects that potentially distribute wheels that are built against a different version of OpenSSL. I see two things that should get some thought: 1. How to have a package provide for another package (there are keywords but AFAIK they are currently ignored by pip) 2. How to handle/deal with shared libraries that are not versioned Thanks, Bert [1]: https://github.com/psycopg/psycopg2/issues/674 <https://github.com/psycopg/psycopg2/issues/674> [2]: https://github.com/psycopg/psycopg2/issues/883 <https://github.com/psycopg/psycopg2/issues/883> [3]: https://github.com/zalando/patroni/issues/1021#issuecomment-480202590 <https://github.com/zalando/patroni/issues/1021#issuecomment-480202590>
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