I haven't found an editor included with the Pro-Pack. I have been using PythonWin and saving the scripts in a test folder under poserScripts. It works just fine so far. I've recently had to work the Mac make side of the aisle and have been using the idle that comes with MacPython. It also does a good job. TkInter is a different thing altogether. It's a set of GUI modules that let you create panels, buttons, sliderbars etc. Python and PoserPython scripts are by their nature just text files so any text editor will do to work with them.