Using Python/Ruby with Cocoa

Just wondering what some of the advantages and pitfalls are here. I know Objective-C and I like it, but I also know Python and find it easier and faster to use for many things, plus it has a lot of nice libraries for it. So how does developing in Python work with Xcode? Does it do good syntax highlighting? Autosensing and code completion? How does debugging work, and does it work with X-ray? Do Bindings and CoreData work and do they work well? Can you build into a bundle with resources? Is there anything you don't get with Python that you do using Obj-C? Thanks if you have any insights for me.