Writing a script to add comments to a python file

[Joshua Moore]

Hi gnu.emacs.help

I've been using the basic features of emacs for a while now, and would like to 
add my own functions to it. 

What would be a good way to implement a command that adds a comment symbol (#) 
to a selected region in a python file?

I can read and write a little bit of lisp-like languages, but I don't know how 
to access the region of selected text, edit the lines or where to save the 
script.

Any help is appreciated.

-- 
Josh