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:mod:`copy_reg` --- Register :mod:`pickle` support functions
============================================================
.. module:: copy_reg
:synopsis: Register pickle support functions.
.. index::
module: pickle
module: cPickle
module: copy
The :mod:`copy_reg` 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*.
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