13. Data Persistence
The modules described in this chapter support storing Python data in a
persistent form on disk. The pickle and marshal
modules can turn many Python data types into a stream of bytes and
then recreate the objects from the bytes. The various DBM-related
modules support a family of hash-based file formats that store a
mapping of strings to other strings. The bsddb module also
provides such disk-based string-to-string mappings based on hashing,
and also supports B-Tree and record-based formats.
The list of modules described in this chapter is:
pickle
Convert Python objects to streams of bytes and back.
copy_reg
Register
pickle support functions.
shelve
Python object persistence.
marshal
Convert Python objects to streams of bytes and back
(with different constraints).
anydbm
Generic interface to DBM-style database modules.
whichdb
Guess which DBM-style module created a given database.
dbm
The standard ``database'' interface, based on ndbm.
gdbm
GNU's reinterpretation of dbm.
dbhash
DBM-style interface to the BSD database library.
bsddb
Interface to Berkeley DB database library
dumbdbm
Portable implementation of the simple DBM interface.
sqlite3
A DB-API 2.0 implementation using SQLite 3.x.
Release 2.5, documentation updated on 19th September, 2006.
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