ChapterÂ 17.Â Databases and Persistence
âGive Me an Order of Persistence, but Hold the Picklesâ
So far in this book, weâve used Python in the system programming, GUI development, and Internet scripting domainsâthree of Pythonâs most common applications, and representative of its use as an application programming language at large. In the next four chapters, weâre going to take a quick look at other major Python programming topics: persistent data, data structure techniques, text and language processing, and Python/C integration.
These four topics are not really application areas themselves, but they are techniques that span domains. The database topics in this chapter, for instance, can be applied on the Web, in desktop GUI applications, and so on. Text processing is a similarly general tool. Moreover, none of these final four topics is covered exhaustively (each could easily fill a book alone), but weâll sample Python in action in these domains and highlight their core concepts and tools. If any of these chapters spark your interest, additional resources are readily available in the Python world.
Persistence Options in Python
In this chapter, our focus is on persistent dataâthe kind that outlives a program that creates it. Thatâs not true by default for objects a script constructs, of course; things like lists, dictionaries, and even class instance objects live in your computerâs memory and are lost as soon as the script ends. To make data live longer, we need to ...