I use pyqt (pyside should be equivalent but with more relaxed license terms) and I find it pleasing and useful -- I also like the fact that (with no extra effort on my part) it gives me cross-platform apps!-)
pyobjc (comes w/your Mac, works w/Xcode, etc) may be preferable for apps you never want to be cross-platform, but I find it less easily usable than PyQt. However if you're very skilled in Objective C, Cocoa etc, I imagine pyobjc will feel perfectly natural and usable to you!-).
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