gistfile1.md

The brew versions command has been removed. The instructions are no longer valid.

Prerequisits

Make sure you don't have any Python 3.x installed:

$ brew uninstall python3

Then cd into your brew directory, this is /usr/local normally:

$ cd /usr/local

Then list all the available Python 3.x versions in Homebrew:

$ brew versions python3

Python 3.0

Sorry, not available with Homebrew.

Python 3.1

$ git checkout 0476235 Library/Formula/python3.rb
$ brew install python3
$ brew unlink python3
$ ln -s ../Cellar/python3/3.1.3/bin/python3.1 bin/python3.1

Python 3.2

$ git checkout f33f3ea Library/Formula/python3.rb

This formula requires X11, but if you don't have/want it, do not dispair. In Library/Formula/python3.rb on line 44, remove this line:

  depends_on :x11 # tk.h includes X11/Xlib.h and X11/X.h

Also, sqlite didn't work on my machine, so replace this line:

  depends_on 'sqlite'   => :optional  # Prefer over OS X's older version

By this:

  depends_on 'sqlite' => :build

Then install as usual:

$ brew install python3
$ brew unlink python3
$ ln -s ../Cellar/python3/3.2.3/bin/python3.2 bin/python3.2

Python 3.3

$ git checkout fedb343 Library/Formula/python3.rb
$ brew install python3
$ brew unlink python3
$ ln -s ../Cellar/python3/3.3.5/bin/python3.3 bin/python3.3

Python 3.4

$ git checkout HEAD Library/Formula/python3.rb
$ brew install python3