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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*; *type* must not be a "classic" class object. (Classic classes are
+ handled differently; see the documentation for the :mod:`pickle` module for
+ details.) *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*.
+