如果要使用Homebrew安装Python 3：
$ brew install python3==> Downloading http://python.org/ftp/python/3.3.0/Python-3.3.0.tar.bz2Already downloaded: /Library/Caches/Homebrew/python3-3.3.0.tar.bz2==> ./configure --prefix=/usr/local/Cellar/python3/3.3.0 --enable-ipv6 --datarootdir=/usr/local/Cell==> make==> make install PYTHonAPPSDIR=/usr/local/Cellar/python3/3.3.0==> make frameworkinstallextras PYTHonAPPSDIR=/usr/local/Cellar/python3/3.3.0/share/python3==> Downloading https://pypi.python.org/packages/source/d/distribute/distribute-0.6.35.tar.gzAlready downloaded: /Library/Caches/Homebrew/distribute-0.6.35.tar.gz==> /usr/local/Cellar/python3/3.3.0/bin/python3.3 -s setup.py install --force --verbose --install-li==> Downloading https://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gzAlready downloaded: /Library/Caches/Homebrew/pip-1.3.1.tar.gz==> /usr/local/Cellar/python3/3.3.0/bin/python3.3 -s setup.py install --force --verbose --install-li==> CaveatsHomebrew's Python3 framework /usr/local/Cellar/python3/3.3.0/frameworks/Python.frameworkDistribute and Pip have been installed. To update them pip3 install --upgrade distribute pip3 install --upgrade pipTo symlink "Idle 3" and the "Python Launcher 3" to ~/Applications `brew linkapps`You can install Python packages with `pip3 install <your_favorite_package>`They will install into the site-package directory /usr/local/lib/python3.3/site-packagesExecutable python scripts will be put in: /usr/local/share/python3so you may want to put "/usr/local/share/python3" in your PATH, too.See: https://github.com/mxcl/homebrew/wiki/Homebrew-and-Python
安装完成后，更新系统
PATH变量，将下一行添加到
~/.bash_profile
export PATH=/usr/local/bin:/usr/local/sbin:~/bin:$PATH
接着：
$ source ~/.bash_profile
现在启动Python：
$ python3Python 3.3.0 (default, Mar 26 2013, 10:01:40) [GCC 4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.27)] on darwinType "help", "copyright", "credits" or "license" for more information.>>>
您可以检查python3路径：
$ which python3/usr/local/bin/python3
