Setup Python Development Environment on Mountain Lion

By default, Mac OS X Mountain Lion comes with Python 2.7 same as Mac OS X Lion.

So far, I am facing some glitches on setup Python development environment on Mac OS X Mountain Lion as below:

• Running 'brew doctor' warns us that 'X11 is not installed', when I was using Homebew. Mac OS X Mountain Lion is not supporting X11 app and Xgrid.
• Need to install 'Command line tools for Xcode' from Apple Developer after Xcode installed. Installing 'Command line tools' from Xcode preference does not work for me. I was facing this problem while running virtualenv.