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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 copy_reg.rst shelve.rst marshal.rst anydbm.rst whichdb.rst dbm.rst gdbm.rst dbhash.rst bsddb.rst dumbdbm.rst sqlite3.rst