\section{\module{copy_reg} ---         Register \module{pickle} support functions} \declaremodule[copyreg]{standard}{copy_reg}\modulesynopsis{Register \module{pickle} support functions.}  The \module{copy_reg} module provides support for the\refmodule{pickle}\refstmodindex{pickle}\ and\refmodule{cPickle}\refbimodindex{cPickle}\ modules.  The\refmodule{copy}\refstmodindex{copy}\ module is likely to use this in thefuture as well.  It provides configuration information about objectconstructors which are not classes.  Such constructors may be factoryfunctions or class instances.  \begin{funcdesc}{constructor}{object}  Declares \var{object} to be a valid constructor.  If \var{object} is  not callable (and hence not valid as a constructor), raises  \exception{TypeError}.\end{funcdesc} \begin{funcdesc}{pickle}{type, function\optional{, constructor}}  Declares that \var{function} should be used as a ``reduction''  function for objects of type \var{type}; \var{type} must not be a  ``classic'' class object.  (Classic classes are handled differently;  see the documentation for the \refmodule{pickle} module for  details.)  \var{function} should return either a string or a tuple  containing two or three elements.   The optional \var{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 \var{function} at  pickling time.  \exception{TypeError} will be raised if  \var{object} is a class or \var{constructor} is not callable.   See the \refmodule{pickle} module for more  details on the interface expected of \var{function} and  \var{constructor}.\end{funcdesc}