Data Persistence - Python 3.11.1 documentation 编辑

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 list of modules described in this chapter is:

• pickle — Python object serialization
  • Relationship to other Python modules
    • Comparison with marshal
    • Comparison with json
  • Data stream format
  • Module Interface
  • What can be pickled and unpickled?
  • Pickling Class Instances
    • Persistence of External Objects
    • Dispatch Tables
    • Handling Stateful Objects
  • Custom Reduction for Types, Functions, and Other Objects
  • Out-of-band Buffers
    • Provider API
    • Consumer API
    • Example
  • Restricting Globals
  • Performance
  • Examples
• copyreg — Register pickle support functions
  • Example
• shelve — Python object persistence
  • Restrictions
  • Example
• marshal — Internal Python object serialization
• dbm — Interfaces to Unix “databases”
  • dbm.gnu — GNU’s reinterpretation of dbm
  • dbm.ndbm — Interface based on ndbm
  • dbm.dumb — Portable DBM implementation
• sqlite3 — DB-API 2.0 interface for SQLite databases
  • Tutorial
  • Reference
    • Module functions
    • Module constants
    • Connection objects
    • Cursor objects
    • Row objects
    • Blob objects
    • PrepareProtocol objects
    • Exceptions
    • SQLite and Python types
    • Default adapters and converters
  • How-to guides
    • How to use placeholders to bind values in SQL queries
    • How to adapt custom Python types to SQLite values
      • How to write adaptable objects
      • How to register adapter callables
    • How to convert SQLite values to custom Python types
    • Adapter and converter recipes
    • How to use connection shortcut methods
    • How to use the connection context manager
    • How to work with SQLite URIs
    • How to create and use row factories
  • Explanation
    • Transaction control