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If last isn't specified it defaults to first, i.e. If last is omitted, returns the contents of the listbox element indicated by first, or an empty string if first refers to a non-existent element.
If last is specified, the command returns a list whose elements are all of the listbox elements between first and last, inclusive.
Query or modify the configuration options of an item in the listbox.An index specifies a particular element of the listbox, in any of the following ways: In the method descriptions below, arguments named index, first, and last always contain text indices in one of the above forms. This object supports the configure and cget methods described in Tk::options which can be used to enquire and modify the options described above.The widget also inherits all the methods provided by the generic Tk:: Widget class.If a listbox is exporting its selection (see export Selection option), then it will observe the standard X11 protocols for handling the selection.Listbox selections are available as type STRING; the value of the selection will be the text of the selected elements, with newlines separating the elements.
The first two elements of the list give the x and y coordinates of the upper-left corner of the screen area covered by the text (specified in pixels relative to the widget) and the last two elements give the width and height of the area, in pixels.