Whats the best way to grab/parse command line arguments passed to a Python script?

This my Answer to the stackoverflow question: What's the best way to grab/parse command line arguments passed to a Python script?:

I think the best way for larger projects is optparse, but if you are looking for an easy way, maybe http://werkzeug.pocoo.org/documentation/script is something for you.

from werkzeug import script

# actions go here
def action_foo(name=""):
    """action foo does foo"""
    pass

def action_bar(id=0, title="default title"):
    """action bar does bar"""
    pass

if __name__ == '__main__':
    script.run()

So basically every function action_* is exposed to the command line and a nice help message is generated for free.

python foo.py 
usage: foo.py <action> [<options>]
       foo.py --help

actions:
  bar:
    action bar does bar

    --id                          integer   0
    --title                       string    default title

  foo:
    action foo does foo

    --name                        string