This bookmarklet gives you a code editor in your browser with a single click.

Python Notepad Bookmarklet

data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/python");</script>