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Does psycopg2-binary provide the psycopg2 package?
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* Does psycopg2-binary provide the psycopg2 package?
@ 2023-05-22 16:05  Kerrick Staley <[email protected]>
  0 siblings, 1 reply; 2+ messages in thread

From: Kerrick Staley @ 2023-05-22 16:05 UTC (permalink / raw)
  To: psycopg

If I install psycopg2-binary, and then I try to install a package that
depends on psycopg2, will pip "know" that psycopg2-binary satisfies the
psycopg2 requirement and avoid installing psycopg2?

Empirically the answer seems to be "no". I installed psycopg2-binary, then
ran `python3 -m pip install -e .` in a directory with this setup.py file
<https://gist.github.com/kerrick-js/b0962b74853cc297cf2186d251763262;, and
it tried to install psycopg2.

Is there a way that, in my setup.py file, I can depend on either psycopg2
or psycopg2-binary, whichever is available?

Thanks,
Kerrick


^ permalink  raw  reply  [nested|flat] 2+ messages in thread

* Re: Does psycopg2-binary provide the psycopg2 package?
@ 2023-05-23 11:18  Daniele Varrazzo <[email protected]>
  parent: Kerrick Staley <[email protected]>
  0 siblings, 0 replies; 2+ messages in thread

From: Daniele Varrazzo @ 2023-05-23 11:18 UTC (permalink / raw)
  To: Kerrick Staley <[email protected]>; +Cc: psycopg

On Tue, 23 May 2023 at 08:52, Kerrick Staley <[email protected]> wrote:
>
> If I install psycopg2-binary, and then I try to install a package that depends on psycopg2, will pip "know" that psycopg2-binary satisfies the psycopg2 requirement and avoid installing psycopg2?
>
> Empirically the answer seems to be "no". I installed psycopg2-binary, then ran `python3 -m pip install -e .` in a directory with this setup.py file, and it tried to install psycopg2.
>
> Is there a way that, in my setup.py file, I can depend on either psycopg2 or psycopg2-binary, whichever is available?

I don't think there is. You cannot make a package depending on either
one or the other. Python packaging metadata doesn't offer this
flexibility.

In psycopg 3 the only package to depend on is `psycopg`. The
pre-compiled C module (the `psycopg-binary` package on pypi) can be
added as an add-on and it is not necessary for a library to depend on
it. It can be an application requirement instead.

In my projects I use `psycopg` as an abstract dependency (in the
`setup.cfg` of the packages that need psycopg) and
`psycopg-binary==3.x.x` as a concrete dependency (in a
`requirements.txt` file generated by `pip-tools` using `psycopg-binary
in the `requirements.in`)

More details about psycopg 3 versions management are available at
https://www.psycopg.org/psycopg3/docs/basic/install.html#handling-dependencies

-- Daniele






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