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Add a suggestion to make more callables picklable (as multiprocessing 

already does)
This commit is contained in:
Antoine Pitrou 2011-08-16 12:12:02 +02:00
parent f484655b83
commit 605d5638fe
1 changed files with 14 additions and 3 deletions
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pep-3154.txt
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@ -67,12 +67,20 @@ Currently, classes whose __new__ mandates the use of keyword-only arguments
can not be pickled (or, rather, unpickled) [3]_. Both a new special method can not be pickled (or, rather, unpickled) [3]_. Both a new special method
(``__getnewargs_ex__`` ?) and a new opcode (NEWOBJEX ?) are needed. (``__getnewargs_ex__`` ?) and a new opcode (NEWOBJEX ?) are needed.
Serializing more callable objects
---------------------------------
Currently, only module-global functions are serializable. Multiprocessing
has custom support for pickling other callables such as bound methods [4]_.
This support could be folded in the protocol, and made more efficient
through a new GETATTR opcode.
Serializing "pseudo-global" objects Serializing "pseudo-global" objects
----------------------------------- -----------------------------------
Objects which are not module-global, but should be treated in a similar Objects which are not module-global, but should be treated in a similar
fashion -- such as methods [4]_ or nested classes -- cannot currently be fashion -- such as unbound methods [5]_ or nested classes -- cannot currently
pickled (or, rather, unpickled) because the pickle protocol does not be pickled (or, rather, unpickled) because the pickle protocol does not
correctly specify how to retrieve them. One solution would be through the correctly specify how to retrieve them. One solution would be through the
adjunction of a ``__namespace__`` (or ``__qualname__``) to all class and adjunction of a ``__namespace__`` (or ``__qualname__``) to all class and
function objects, specifying the full "path" by which they can be retrieved. function objects, specifying the full "path" by which they can be retrieved.
@ -119,7 +127,10 @@ References
.. [3] "pickle/copyreg doesn't support keyword only arguments in __new__": .. [3] "pickle/copyreg doesn't support keyword only arguments in __new__":
http://bugs.python.org/issue4727 http://bugs.python.org/issue4727
.. [4] "pickle should support methods": .. [4] Lib/multiprocessing/forking.py:
http://hg.python.org/cpython/file/baea9f5f973c/Lib/multiprocessing/forking.py#l54
.. [5] "pickle should support methods":
http://bugs.python.org/issue9276 http://bugs.python.org/issue9276
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