1 

     2 .. _persistence:

     3 

     4 ****************

     5 Data Persistence

     6 ****************

     7 

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

     9 persistent form on disk.  The :mod:`pickle` and :mod:`marshal` modules can turn

    10 many Python data types into a stream of bytes and then recreate the objects from

    11 the bytes.  The various DBM-related modules support a family of hash-based file

    12 formats that store a mapping of strings to other strings.  The :mod:`bsddb`

    13 module also provides such disk-based string-to-string mappings based on hashing,

    14 and also supports B-Tree and record-based formats.

    15 

    16 The list of modules described in this chapter is:

    17 

    18 

    19 .. toctree::

    20 

    21    pickle.rst

    22    copy_reg.rst

    23    shelve.rst

    24    marshal.rst

    25    anydbm.rst

    26    whichdb.rst

    27    dbm.rst

    28    gdbm.rst

    29    dbhash.rst

    30    bsddb.rst

    31    dumbdbm.rst

    32    sqlite3.rst