Feb
12
Sticking with Apple's Python 2.7
Why install a third-party Python 2.7?
Python.org, Homebrew, scipy.org, 69105 different blog posts explaining how to install numpy/scipy/etc. on a Mac, etc. all tell you to install a different Python alongside Apple's.
Installing scipy, etc. for Python 3 on Mac
tl;dr
Install Xcode from the App Store, then install the Command Line Tools from Xcode (Preferences | Downloads | Components). Install Python 3.3.0 (or the latest non-beta version, if you're in the future) by running the "Mac OS X 64-bit/32-bit Installer".
Installing scipy, etc., with Apple's Python 2.7
tl;dr
Install Xcode from the App Store, then install the Command Line Tools from Xcode (Preferences | Downloads | Components).