1. open your source code in vim
        go to Applications >>> Accessories >>> Terminal
        then type vim <codeFileName> then hit Enter
        e.g vim factorial.py
2. convert your code to readable html
       type :runtime! syntax/2html.vim then hit Enter
       note: be sure you are in command mode, if your in insert mode just press Esc

3. save the generated html file
       type :wq <filename.html> then hit Enter
       note: be sure you are in command mode, if your in insert mode just press Esc
       e.g. :wq factorial.html

You can now open the html page of your source code with your favorite web browser.

example output