.. _persistence:

****************

Data Persistence

****************

The modules described in this chapter support storing Python data in a

persistent form on disk.  The :mod:`pickle` and :mod:`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 :mod:`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:

.. toctree::

   pickle.rst

   copy_reg.rst

   shelve.rst

   marshal.rst

   anydbm.rst

   whichdb.rst

   dbm.rst

   gdbm.rst

   dbhash.rst

   bsddb.rst

   dumbdbm.rst

   sqlite3.rst