Arch Linux

I don't like your solution of adding a sip-base package...Also I don't know if you can use both the python2 and python3 version on a system. Does any other distro this?

Of course you can have both of them installed together, as they only share an identical "/usr/bin/sip" file. Just look at the "sip-py3and2" and "pyqt-py3and2" packages, or see my "sip-dev" and "pyqt-dev" packages.

Why don't you like my "sip-base" solution? It's a hell of a lot better than leaving them in a conflicted state! This is a perfect candidate for the new package-splitting capabilities of 'makepkg'.

I didn't want to be rude the first time around, but it's next to useless the way you've got it. Nobody will want to break some packages by removing "python2-qt", just to satisfy some others by installing "python-qt".

If other distributions don't do what I'm suggesting yet, it's probably just because they're lagging behind the times. I've been writing PyQt v4 applications for years, so you can trust my judgement here :-).

Ok, you have convinced me and I'll implement this in the next days :)

Thanks for considering my suggestions carefully. To make things easier for you in a few days, here's a list of changes you'll need to make to your PKGBUILD files, so that these packages can coexist on our systems.

The "package()" section of "python-sip" will need "rm ${pkgdir}/usr/bin/sip". The "build()" section of "python-qt" will need "python3 configure.py --confirm-license --qsci-api". Note that I've removed your "-v /usr/share/sip" argument. The "package()" section of "python-qt" will need:
rm ${pkgdir}/usr/bin/{pylupdate4,pyrcc4,pyuic4}
rm ${pkgdir}/usr/lib/qt/plugins/designer/libpythonplugin.so
rm ${pkgdir}/usr/share/qt/qsci/api/python/PyQt4.api

I should also mention that the removed files from the "package()" section of "python2-qt" and "python-qt" would need to exist in a "pyqt-base" package that both of these depend on.

You can use the ones from "python2-qt", as they work fine with projects intended for "python-qt". I hope all of this makes sense. If not, I'm happy to modify your PKGBUILD files for you.

What I've written above is correct, but further testing has revealed a potentially showstopping problem. The removed files from the "package()" section of "python2-qt" would still require that package in order to work with projects intended for "python-qt".

Given this constraint, you can just do what I've done for "sip-dev" and "pyqt-dev". This would require forcing "python-sip" to depend on "python2-sip" and "python-qt" to depend on "python2-qt". It would prevent the need to create "sip-base" and "pyqt-base" packages!

Your help is really appreciated. This has been an easy work with your info.

Instead of sip-base and pyqt-base, I simply named them respectively sip and pyqt.
We are updating every package to depend on python2-qt now. Packages will be released soon.