=== USAGE:
    pythonbrew [options] [init|install|installed|switch|off|version]
    
    # Initialize
    pythonbrew init
    
    # Install pythonbrew
    pythonbrew install
    
    # Install some Pythons
    pythonbrew install Python-2.6.6
    pythonbrew install Python-2.5.5
    pythonbrew --build-options="CC=gcc_4.1" install Python-2.4.3
    
    # Switch python in the $PATH
    pythonbrew switch Python-2.6.6
    pythonbrew switch /path/to/Python-2.5.5/
    pythonbrew switch /path/to/python
    
    # Disable pythonbrew
    pythonbrew off
    
    # Version
    pythonbrew version
    
=== COMMANDS:
  = init
    Run this once to setup the pythonbrew directory ready for installing
    pythons into. Run it again if you decide to change PYTHONBREW_ROOT.
  
  = install Python-<version>
      Build and install the given version of python.
      
  = installed
      List the installed versions of python.
      
  = switch Python-<version>
      Switch to the given version.

  = switch /path/to/Python-dir/
      Switch to the given version of python in directory.
      
  = switch /path/to/python
      Switch to the given version of python.

  = off
      Disable pythonbrew.

  = version
      Show version.
      
=== OPTIONS:
  = --force
  = --build-options