"copyreg" --- Register "pickle" support functions
*************************************************

**Code source :** Lib/copyreg.py

======================================================================

The "copyreg" module offers a way to define functions used while
pickling specific objects.  The "pickle" and "copy" modules use those
functions when pickling/copying those objects.  The module provides
configuration information about object constructors which are not
classes. Such constructors may be factory functions or class
instances.

copyreg.constructor(object)

   Déclare *object* comme étant un constructeur valide. Si *object*
   n'est pas appelable (et n'est donc pas un constructeur valide),
   l'erreur "TypeError" est levée.

copyreg.pickle(type, function, constructor_ob=None)

   Declares that *function* should be used as a "reduction" function
   for objects of type *type*.  *function* must return either a string
   or a tuple containing between two and six elements. See the
   "dispatch_table" for more details on the interface of *function*.

   The *constructor_ob* parameter is a legacy feature and is now
   ignored, but if passed it must be a callable.

   Note that the "dispatch_table" attribute of a pickler object or
   subclass of "pickle.Pickler" can also be used for declaring
   reduction functions.


Exemple
=======

L'exemple si-dessous essaye de démontrer comment enregistrer une
fonction *pickle* et comment elle sera utilisée :

>>> import copyreg, copy, pickle
>>> class C:
...     def __init__(self, a):
...         self.a = a
...
>>> def pickle_c(c):
...     print("pickling a C instance...")
...     return C, (c.a,)
...
>>> copyreg.pickle(C, pickle_c)
>>> c = C(1)
>>> d = copy.copy(c)
pickling a C instance...
>>> p = pickle.dumps(c)
pickling a C instance...
