Michael Foord <[email protected]> added the comment:
test_pickle still passes with only copyreg.py modified.
With one additional change in pickle.py (line 405 to use type(obj) instead of
obj.__class__) the pickling works as I would hope (I would need assistance to
fix _pickle):
>>> import sys
[65446 refs]
>>> sys.modules['_pickle'] = None
[65448 refs]
>>> import pickle as p
[70090 refs]
>>> class Foo:
... __class__ = property(lambda s: int)
...
[70140 refs]
>>> p.dumps(Foo())
b'\x80\x03c__main__\nFoo\nq\x00)\x81q\x01.'
[70156 refs]
>>> d = p.dumps(Foo())
[70158 refs]
>>> p.loads(d)
<__main__.Foo object at 0x101410a00>
[70216 refs]
>>> f = p.loads(d)
[70219 refs]
>>> f.__class__
<class 'int'>
However, as you suspect Antoine, it is apparently deliberate that proxies
should be pickled as the original:
======================================================================
ERROR: test_newobj_proxies (test.test_pickle.DumpPickle_CLoadPickle)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/compile/py3k-cpython/Lib/test/pickletester.py", line 903, in
test_newobj_proxies
s = self.dumps(p, proto)
File "/compile/py3k-cpython/Lib/test/test_pickle.py", line 33, in dumps
p.dump(arg)
File "/compile/py3k-cpython/Lib/pickle.py", line 235, in dump
self.save(obj)
File "/compile/py3k-cpython/Lib/pickle.py", line 342, in save
self.save_reduce(obj=obj, *rv)
File "/compile/py3k-cpython/Lib/pickle.py", line 405, in save_reduce
"args[0] from __newobj__ args has the wrong class")
_pickle.PicklingError: args[0] from __newobj__ args has the wrong class
----------------------------------------------------------------------
Line 891 from pickletester.py:
def test_newobj_proxies(self):
# NEWOBJ should use the __class__ rather than the raw type
I wonder what the use case for that is? If you serialize a proxy object, why
would the deserialization code not want a proxy back too?
I guess I can look at implementing copyreg functions for my objects instead.
----------
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Python tracker <[email protected]>
<http://bugs.python.org/issue14577>
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