todayand those who do already have the skills required to read the larger and more compete example of integration present in the source code of python itself there is still enough to hint at possibilities herebut vast amounts of code have been cutin deference to the better examples you'll find in python' own code the systems programming part was condensed and reworked the former two larger system examples have been merged into one shorter onewith new or greatly rewritten examples in factthis part (part iiwas probably overhauled the most of any part in the book it incorporates new tools such as subprocess and multiprocessingintroduces sockets earlierand removes dated topics and examples still lingering from prior editions franklya few of the fileoriented examples here dated back to the sand were overdue for general refresh the initial in this part was also split into two to make its material easier to read (shell contextincluding streamsgets its own now)and few large program listings here (including the auto-configuring launcher scriptsare now external suggested reading some larger examples were removed (but are available in the examples distributionalong the same linestwo of the larger gui examples in the prior editionpytree and pyformhave been removed insteadtheir updated code is available in the book' examples distribution packageas suggested supplemental reading you'll still find many larger examples covered and listed in this edition--including both guiand web-based renderings of full-featured email clientsalong with image viewerscalculatorsclocksunicode-aware text editorsdrawing programsregression test scriptsand more howeverbecause the code of the examples removed doesn' add much to what is already coveredand because they were already largely self-study examples anyhowi've made them optional and external to the printed text in this edition the advanced internet topics was replaced by brief summaries 've cut the advanced internet topics completelyleaving only simple summaries at the start of the internet part (intentionally mirroring the gui option summaries at the start of the gui partthis includes prior coverage for tools such as the zope web frameworkcomwindows active scripting and asphtmlgenpython server pages (psp)jythonand the now very dated grail system some of these systems still receive honorable mention in the summariesbut none are now presented in any sort of detail summaries of new tools (including many of those listed in the following paragraphwere added to this setbut againin brief fashion with no example code despite authorsbest attempts to foresee the futurethe web domain evolves faster than books like this can for instanceweb frameworks like djangogoogle' app engineturbogearspylonsand web py are now popular alternatives to zope similarlythe net framework supersedes much of com on windowsironpython now provides the same type of integration for net as jython did first xxviii preface