[Jython-users] more precise description of the issue

[PBlitz <dev...@gm...>]

Here a more precise  description of the issue:
Pickling of a class derived from dict creates an empty pickle in jython
2.2.1. In contrast Python 2.5.2 delivers the expected result.
So I assume a bug in the jython pickle module. Does anyone know if a
developer release of jython already solves the problem? Or how to patch the
module?

# code describing the issue:

class MyDict(dict):
    def __init__(self, d = None):
        if d == None: d = {}
        dict.__init__(self, d)

if __name__ == "__main__":
    import pickle
    md = MyDict({'b': [2, 3], 'z': [0, 1]})
    p = pickle.dumps(md)
    rd = pickle.loads(p)
    print "-> pickle p:\n", p
    print "-> MyDict md:\n", md
    print "-> reconstructed MyDict rd:\n", rd

# jython 2.2.1 output with empty pickle p:

-> pickle p:
c__main__
MyDict
p0
(tp1
Rp2
.
-> MyDict md:
{'b': [2, 3], 'z': [0, 1]}
-> reconstructed MyDict rd:
{}

# in contrast python 2.5.2 output with filled pickle p:

-> pickle p:
ccopy_reg
_reconstructor
p0
(c__main__
MyDict
p1
c__builtin__
dict
p2
(dp3
S'b'
p4
(lp5
I2
aI3
asS'z'
p6
(lp7
I0
aI1
astp8
Rp9
.
-> MyDict md:
{'b': [2, 3], 'z': [0, 1]}
-> reconstructed MyDict rd:
{'b': [2, 3], 'z': [0, 1]}
-- 
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