[ python-Bugs-1281556 ] exception when unpickling array.array objects

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Bugs item #1281556, was opened at 2005-09-04 05:19
Message generated for change (Settings changed) made by rhettinger
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: John Machin (sjmachin)
>Assigned to: Nobody/Anonymous (nobody)
Summary: exception when unpickling array.array objects

Initial Comment:
Note 1: same error for pickle and cPickle
Note 2: pickle.dumps and cPickle.dumps produce 
different results [see below] -- is this expected?

Python 2.4.1 (#65, Mar 30 2005, 09:13:57) [MSC v.1310 
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more 
information.
>>> import pickle, cPickle, array
>>> ia = array.array('i',[3,2,1])
>>> ia
array('i', [3, 2, 1])
>>> pia = pickle.dumps(ia, -1)
>>> pia
'\x80\x02carray\narray\nq\x00)\x81q\x01.'
>>> cia = cPickle.dumps(ia, -1)
>>> pia == cia
False
>>> cia
'\x80\x02carray\narray\nq\x01)\x81q\x02.'
>>> pickle.loads(pia)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Python24\lib\pickle.py", line 1394, in loads
    return Unpickler(file).load()
  File "C:\Python24\lib\pickle.py", line 872, in load
    dispatch[key](self)
  File "C:\Python24\lib\pickle.py", line 1097, in 
load_newobj
    obj = cls.__new__(cls, *args)
TypeError: array() takes at least 1 argument (0 given)
>>> pickle.loads(cia)
[same as above]
>>> cPickle.loads(pia)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: array() takes at least 1 argument (0 given)
>>> cPickle.loads(cia)
[same as above]
>>>

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Comment By: John Machin (sjmachin)
Date: 2005-09-04 05:46

Message:
Logged In: YES 
user_id=480138

Refer bug report 1281383.

Please fix the bug in Python 2.4: if array objects are not
pickleable in 2.4, then pickle and cPickle should raise a
PickleError [like they used to in earlier versions] --
instead of guessing wrongly and misleading callers into
thinking that the objects can be pickled.

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