[ python-Bugs-1672332 ] cPickle can pickle, but cannot unpickle on 64bit machines

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Bugs item #1672332, was opened at 2007-03-02 12:10
Message generated for change (Comment added) made by sgala
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Category: Python Library
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Bartlomiej Ogryczak (oneg)
Assigned to: Nobody/Anonymous (nobody)
Summary: cPickle can pickle, but cannot unpickle on 64bit machines

Initial Comment:
Seems that on 64-bit machines cPickle is able to pickle floats smaller then DBL_MIN, but it's unable to unpickle them. 

64-bit machine (Solaris 10 on Sparc)
Python 2.4.4 (#1, Oct 26 2006, 10:01:37)
[GCC 3.3.4] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
>>> cPickle.dumps(1e-310)
'F9.9999999999999694e-311\n.'
>>> cPickle.loads(_)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ValueError: could not convert string to float

Same thing works fine on 32-bit machine (P4 with MS Windows)
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cPickle
>>> cPickle.dumps(1e-310)
'F0\n.'
>>>


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Comment By: Santiago Gala (sgala)
Date: 2007-03-05 17:38

Message:
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FYI: it doesn't happen for me in python 2.4.3, 2.5svn and 2.6svn built on
linux (x86_64) with gcc-4.1.2, so it looks compiler version or hw platform
specific.

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