Message3083

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.
I dont know how to solve the problem. 
# code:
from __future__ import generators
class MyDict(dict): 
 def __init__(self, d = None):
 if d == None: d = {}
 dict.__init__(d)
if __name__ == "__main__":
 import pickle 
 
 dd = MyDict()
 dd['z'] = [0,1]
 dd['b'] = [2,3]
 p = pickle.dumps(dd)
 print "-> pickle p:\n", p
 u = pickle.loads(p)
 print "-> MyDict dd:\n", dd
 print "-> reconstructed MyDict u:\n", u
# jython 2.2.1 output with empty pickle p:
-> pickle p:
c__main__
MyDict
p0
(tp1
Rp2
.
-> MyDict dd:
{'b': [2, 3], 'z': [0, 1]}
-> reconstructed MyDict u:
{}
# 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'z'
p4
(lp5
I0
aI1
asS'b'
p6
(lp7
I2
aI3
astp8
Rp9
.
-> MyDict dd:
{'z': [0, 1], 'b': [2, 3]}
-> reconstructed MyDict u:
{'z': [0, 1], 'b': [2, 3]}