an html rendition of this text in spawned web browser is also availablebut simple text is sufficient for many people' tastes +the cancel button makes this nonmodal ( nonblockingwindow go away more interestinglythe source button pops up pyedit text editor viewer windows for all the source files of pymailgui' implementationfigure - captures one of these (there are manythis is intended as demonstrationnot as development environmentnot every program shows you its source codebut pymailgui follows python' open source motif new in this editionhelp is also displayed in html form in web browserin addition to or instead of the scrolled text display just shown choosing help in texthtmlor both is controlled by setting in the mailconfig module the html flavor uses the python webbrowser module to pop up the html file in browser on the local machine+actuallythe help display started life even less fancyit originally displayed help text in standard information pop up common dialoggenerated by the tkinter showinfo call used earlier in the book this worked fine on windows (at least with small amount of help text)but it failed on linux because of default line-length limit in information pop-up boxeslines were broken so badly as to be illegible over the yearscommon dialogs were replaced by scrolled textwhich has now been largely replaced by htmli suppose the next edition will require holographic help interface the pymailgui client