45 lines
1.6 KiB
ReStructuredText
45 lines
1.6 KiB
ReStructuredText
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:mod:`copy_reg` --- Register :mod:`pickle` support functions
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============================================================
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.. module:: copy_reg
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:synopsis: Register pickle support functions.
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.. note::
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The :mod:`copy_reg` module has been renamed to `copyreg` in Python 3.0.
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.. index::
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module: pickle
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module: cPickle
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module: copy
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The :mod:`copy_reg` module provides support for the :mod:`pickle` and
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:mod:`cPickle` modules. The :mod:`copy` module is likely to use this in the
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future as well. It provides configuration information about object constructors
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which are not classes. Such constructors may be factory functions or class
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instances.
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.. function:: constructor(object)
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Declares *object* to be a valid constructor. If *object* is not callable (and
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hence not valid as a constructor), raises :exc:`TypeError`.
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.. function:: pickle(type, function[, constructor])
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Declares that *function* should be used as a "reduction" function for objects of
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type *type*; *type* must not be a "classic" class object. (Classic classes are
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handled differently; see the documentation for the :mod:`pickle` module for
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details.) *function* should return either a string or a tuple containing two or
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three elements.
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The optional *constructor* parameter, if provided, is a callable object which
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can be used to reconstruct the object when called with the tuple of arguments
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returned by *function* at pickling time. :exc:`TypeError` will be raised if
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*object* is a class or *constructor* is not callable.
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See the :mod:`pickle` module for more details on the interface expected of
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*function* and *constructor*.
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