Apple today seeded Xcode 7 beta 6 to registered developers, more than two weeks after releasing Xcode 7 beta 5 alongside the fifth beta of iOS 9.
Xcode 7 beta 6 can be downloaded from the software update mechanism in the Mac App Store or through the Apple Developer Center.
Xcode 7 is designed to accompany Apple's next-generation operating systems: iOS 9, OS X 10.11 El Capitan, and watchOS 2, all of which will be released to the public in the coming weeks. Xcode 7 supports Swift 2.0 and includes new features like user interface testing and updated playgrounds.
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http://learnpythonthehardway.org/book/
Python comes preinstalled with OS X and Linux. It's really easy to install on Windows, too.