Enabling pyobjc on python3Packages

[siraben]

Describe the bug
pyobjc fails to build when the disabled = isPy3k; line is removed and one attempts to build the package for Python 3. Currently, barely any packages in nixpkgs depend on pyobjc but making something like swaglyrics (which is a Python 3 application) buildable on macOS requires pyobjc as a dependency. It would be nice to investigate why the build fails and what can be done.

Snipped build log

Finished executing setuptoolsBuildPhase
installing
Executing pipInstallPhase
/private/var/folders/s1/sm71lqk553d1_f8drd3tz_5r0000gn/T/nix-build-python3.8-pyobjc-6.2.2.drv-0/pyobjc-6.2.2/dist /private/var/folders/s1/sm71lqk553d1_f8drd3tz_5r0000gn/T/nix-build-python3.8-pyobjc-6.2.2.drv-0/pyobjc-6.2.2
Processing ./pyobjc-6.2.2-py3-none-any.whl
ERROR: Could not find a version that satisfies the requirement pyobjc-framework-LinkPresentation==6.2.2; platform_release >= "19.0" (from pyobjc==6.2.2) (from versions: none)
ERROR: No matching distribution found for pyobjc-framework-LinkPresentation==6.2.2; platform_release >= "19.0" (from pyobjc==6.2.2)

To Reproduce
nix-build -A python3Packages.pyobjc

[veprbl]

Looks like the package is very much broken. It is marked with disabled = !isPy3k;, but the already build requires Python 3. Also, I don't think it can be completely built from a pypi fetch unless we package all the frameworks [1] separately. It should be easier to fetch from github and let them all build at once, I suppose.

cc @sauyon as maintainer

[1] https://pypi.org/search/?q=pyobjc-framework&o=

[sauyon]

Feel free to make a PR for this, I don't actually use OS X so being maintainer on this is probably a mistake.

[SuperSandro2000]

Looks like the package is very much broken. It is marked with disabled = !isPy3k;, but the already build requires Python 3. Also, I don't think it can be completely built from a pypi fetch unless we package all the frameworks [1] separately. It should be easier to fetch from github and let them all build at once, I suppose.

cc @sauyon as maintainer

[1] pypi.org/search/?q=pyobjc-framework&o=

Well, to late for that.

[stale]

I marked this as stale due to inactivity. → More info

[siraben]

Still relevant to me.

[bergkvist]

Also relevant to me: jupyterlab/jupyterlab#9863

[yaitskov]

Me too. Guys. I am new to python and nix.
I have no clue what is "platform_release"??
Googling give not relevant results. Is it about Mac? Python or Python in Nix?

[stale]

I marked this as stale due to inactivity. → More info

[siraben]

It would be great to see if we can get this in for ZHF.

[SuperSandro2000]

It is totally out of question that we can get that done until the end of November. This is a major task that requires some planning and probably adds ~50 packages.

[ferrine]

Hey, I have a MWE enabling the build of pyobjc-core #336801, is that helpful?

[adrian-gierakowski]

I need this. What can I do to help?

[ferrine]

I need this. What can I do to help?

I started working on a PR and got swamped with dayjob, let me do something today. I'll leave comments and mention you

[pwnwriter]

Any update on this?

[ferrine]

Not yet, did not find time to come back this week. There was an update recently that makes it easier to build pyobjc, so it is coming soon

[samuela]

Also necessary to package rumps which is important to me.