Staging
v0.5.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Raw File
Tip revision: c1e689ec9677f3222790aaf7da5c8c7361e50115 authored by Barry Warsaw on 19 June 2008, 00:35:43 UTC
Bump to 3.0b1
Tip revision: c1e689e
copyreg.rst

:mod:`copyreg` --- Register :mod:`pickle` support functions
============================================================

.. module:: copyreg
   :synopsis: Register pickle support functions.


.. index::
   module: pickle
   module: cPickle
   module: copy

The :mod:`copyreg` module provides support for the :mod:`pickle` and
:mod:`cPickle` modules.  The :mod:`copy` module is likely to use this in the
future as well.  It provides configuration information about object constructors
which are not classes.  Such constructors may be factory functions or class
instances.


.. function:: constructor(object)

   Declares *object* to be a valid constructor.  If *object* is not callable (and
   hence not valid as a constructor), raises :exc:`TypeError`.


.. function:: pickle(type, function[, constructor])

   Declares that *function* should be used as a "reduction" function for objects
   of type *type*.  *function* should return either a string or a tuple
   containing two or three elements.

   The optional *constructor* parameter, if provided, is a callable object which
   can be used to reconstruct the object when called with the tuple of arguments
   returned by *function* at pickling time.  :exc:`TypeError` will be raised if
   *object* is a class or *constructor* is not callable.

   See the :mod:`pickle` module for more details on the interface expected of
   *function* and *constructor*.

back to top