[Python-checkins] cpython (3.2): #11481: update copyreg docs and add example.
ezio.melotti
python-checkins at python.org
Thu Nov 8 10:06:34 CET 2012
http://hg.python.org/cpython/rev/12dbb3187105
changeset: 80304:12dbb3187105
branch: 3.2
parent: 80301:ea04a7d2407d
user: Ezio Melotti <ezio.melotti at gmail.com>
date: Thu Nov 08 11:04:57 2012 +0200
summary:
#11481: update copyreg docs and add example.
files:
Doc/library/copy.rst | 4 ++--
Doc/library/copyreg.rst | 29 ++++++++++++++++++++++++++---
2 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/Doc/library/copy.rst b/Doc/library/copy.rst
--- a/Doc/library/copy.rst
+++ b/Doc/library/copy.rst
@@ -67,8 +67,8 @@
Classes can use the same interfaces to control copying that they use to control
pickling. See the description of module :mod:`pickle` for information on these
-methods. The :mod:`copy` module does not use the :mod:`copyreg` registration
-module.
+methods. In fact, :mod:`copy` module uses the registered pickle functions from
+:mod:`copyreg` module.
.. index::
single: __copy__() (copy protocol)
diff --git a/Doc/library/copyreg.rst b/Doc/library/copyreg.rst
--- a/Doc/library/copyreg.rst
+++ b/Doc/library/copyreg.rst
@@ -9,9 +9,10 @@
module: pickle
module: copy
-The :mod:`copyreg` module provides support for the :mod:`pickle` module. 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.
+The :mod:`copyreg` module offers a way to define fuctions used while pickling
+specific objects. The :mod:`pickle` and :mod:`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.
@@ -35,3 +36,25 @@
See the :mod:`pickle` module for more details on the interface expected of
*function* and *constructor*.
+
+Example
+-------
+
+The example below would like to show how to register a pickle function and how
+it will be used:
+
+ >>> import copyreg, copy, pickle
+ >>> class C(object):
+ ... 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...
--
Repository URL: http://hg.python.org/cpython
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