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.. _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
copyreg.rst
shelve.rst
marshal.rst
dbm.rst
bsddb.rst
sqlite3.rst
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