copyreg --- Register pickle support functionsSource code: Lib/copyreg.py
[UNKNOWN NODE transition]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)
Declares object to be a valid constructor. If object is not callable (and
hence not valid as a constructor), raises TypeError.
copyreg.pickle(type, function, constructor=None)
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. TypeError will be raised if
object is a class or constructor is not callable.
See the pickle module for more details on the interface
expected of function and constructor. Note that the
dispatch_table attribute of a pickler
object or subclass of pickle.Pickler can also be used for
declaring reduction functions.
The example below would like to show how to register a pickle function and how it will be used:
[UNKNOWN NODE doctest_block]