The Tk Text Widget (Linux Journal)
All script writers need to deal with textual data at one time or another. One of the most powerful tools for manipulating text in the free software world is the text widget found in the Tk graphical user interface (GUI) toolkit. This widget is available to script writers working with Tcl, Perl/Tk and Tkinter in Python, and it boasts features and functionality that can solve almost any text-related requirement a script writer is likely to encounter."