List of additions/changes 1. EditorWindow uses LineNumber.Text instead of tkinter.Text. 2. Added linenumber canvas to IDLE windows except PyShell 3. Some info about LineNumber.Text a) Inherits tk.Text b) Generates <<Changed>> virtual event, when insert, delete, replace, cursor changes position, window resized, scrolled etc. Nothing else is affected. The result of the original call is returned. 4. LineNumber.LineNumberCanvas info a) font_color and breakpoint_color have default values b) Linenumber and breakpoints disabled by default. Instantiating a LineNumberCanvas object does not pack it. c) Pack it programmatically by calling its "attach" method. Compulsorily supply the text widget to attach to. Supply other parameters like font_color, background, breakpoint_color as necessary. d) Unpack using "detach" method. e) Breakpoint feature is enabled only if LineNumberCanvas can "see" an EditorWindow instance called "editwin" as its attribute. It(editwin) should implement set_breakpoint(linenumber) and clear_breakpoint(linenumber) methods. EditorWindow responsible for binding breakpoint action on the canvas to LineNumberCanvas' toggle_breakpoint method. f) Contains a htest for GUI testing linenumbering and breakpoints. g) Any valid color can be set for linenumber canvas' background, its font color and breakpoint color. NS: Breakpoint does not have a background color. h) Linenumber canvas enabled by default. 5. Linenumber preferences in configDialog's "General" tab. Highlight preferences in configDialog's "Highlight" tab. 6. Other changes a) Refactoring of PyShell's set_breakpoint_here, set_breakpoint, clear_breakpoint_here and clear_breakpoint to make more consistent.