describe in moment in terms of the essentialsthoughthe python story--and this book' main journey--is now complete along the wayyou've seen just about everything there is to see in the language itselfand in enough depth to apply to most of the code you are likely to encounter in the open source "wild you've studied built-in typesstatementsand exceptionsas well as tools used to build up the larger program units of functionsmodulesand classes you've also explored important software design issuesthe complete oop paradigmfunctional programing toolsprogram architecture conceptsalternative tool tradeoffsand more--compiling skill set now qualified to be turned loose on the task of developing real applications the python toolset from this point forwardyour future python career will largely consist of becoming proficient with the toolset available for application-level python programming you'll find this to be an ongoing task the standard libraryfor examplecontains hundreds of modulesand the public domain offers still more tools it' possible to spend decades seeking proficiency with all these toolsespecially as new ones are constantly appearing to address new technologies (trust me on this-- ' at years and counting!speaking generallypython provides hierarchy of toolsetsbuilt-ins built-in types like stringslistsand dictionaries make it easy to write simple programs fast python extensions for more demanding tasksyou can extend python by writing your own functionsmodulesand classes compiled extensions although we don' cover this topic in this bookpython can also be extended with modules written in an external language like or +because python layers its toolsetsyou can decide how deeply your programs need to delve into this hierarchy for any given task--you can use built-ins for simple scriptsadd python-coded extensions for larger systemsand code compiled extensions for advanced work we've only covered the first two of these categories in this bookand that' plenty to get you started doing substantial programming in python beyond thisthere are toolsresourcesor precedents for using python in nearly any computer domain you can imagine for pointers on where to go nextsee ' overview of python applications and users you'll likely find that with powerful open source language like pythoncommon tasks are often much easierand even enjoyablethan you might expect designing with exceptions