[Pythonmac-SIG] fpconst vs pickle

[Willard Myers]

I have the same Python 2.3c2+ installed on two different machines here,  
along with the very useful fpconst module (which is pure Python). On  
one machine, I can pickle/unpickle (with pickle or cPickle) the  
constants defined in fpconst; on the other I hit a ValueError on  
unpickle.  I have different versions of Mac OS X on the two machines;  
can that really cause this behavior? If that were so, I'd expect the  
first case below to fail and the other to succeed :-<

Details:

=== Works ===
[abenaki:~] wlmyers% python
Python 2.3c2+ (#12, Jul 25 2003, 12:58:00)
[GCC 3.1 20020420 (prerelease)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import fpconst, pickle
 >>> infinity = pickle.dumps(fpconst.PosInf)
 >>> print infinity
FInf
.
 >>> pickle.loads(infinity)
Inf
 >>> type(pickle.loads(infinity))
<type 'float'>
 >>> import os
 >>> os.uname()
('Darwin', 'Abenaki.local.', '7.0.0b1', 'Darwin Kernel Version 7.0.0b1:  
Mon Jun 16 23:01:44 PDT 2003; root:xnu/xnu-452.1.obj~1/RELEASE_PPC ',  
'Power Macintosh')

=== Doesn't work ===
[mawson:Programming/Python/fpconst-0.6.0] wlmyers% python
Python 2.3c2+ (#12, Jul 25 2003, 12:58:00)
[GCC 3.1 20020420 (prerelease)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import fpconst, pickle
 >>> infinity = pickle.dumps(fpconst.PosInf)
 >>> print infinity
FInf
.
 >>> pickle.loads(infinity)
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File  
"/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
pickle.py", line 1394, in loads
     return Unpickler(file).load()
   File  
"/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
pickle.py", line 872, in load
     dispatch[key](self)
   File  
"/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
pickle.py", line 968, in load_float
     self.append(float(self.readline()[:-1]))
ValueError: invalid literal for float(): Inf
 >>> import os
 >>> os.uname()
('Darwin', 'Mawson.local.', '6.6', 'Darwin Kernel Version 6.6: Thu May   
1 21:48:54 PDT 2003; root:xnu/xnu-344.34.obj~1/RELEASE_PPC ', 'Power  
Macintosh')
 >>>

   Bill