[Python-bugs-list] [ python-Bugs-759889 ] Pickling of Random is broken

Tue, 24 Jun 2003 10:18:10 -0700

Bugs item #759889, was opened at 2003-06-24 10:40
Message generated for change (Comment added) made by rhettinger
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=759889&group_id=5470

Category: Extension Modules
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Frank McIngvale (frankmci)
>Assigned to: Raymond Hettinger (rhettinger)
Summary: Pickling of Random is broken

Initial Comment:
The following shows pickling of Randoms doesn't work in
2.3b1

Python 2.3b1 (#1, Jun 17 2003, 17:56:12)              

[GCC 2.95.3 20010315 (release)] on linux2             

Type "help", "copyright", "credits" or "license" for
more information.                                 
>>> import pickle                                     

>>> import random                                     

>>> r = random.Random()                               

>>> pickle.dumps(r)                                   

Traceback (most recent call last):                    

  File "<stdin>", line 1, in ?                        

  File "/usr/lib/python2.3/pickle.py", line 1386, in
dumps                                             
    Pickler(file, protocol, bin).dump(obj)            

  File "/usr/lib/python2.3/pickle.py", line 231, in
dump                                               
    self.save(obj)                                    

  File "/usr/lib/python2.3/pickle.py", line 338, in
save                                               
    self.save_reduce(obj=obj, *rv)                    

  File "/usr/lib/python2.3/pickle.py", line 415, in
save_reduce                                        
    save(args)                                        

  File "/usr/lib/python2.3/pickle.py", line 293, in
save                                               
    f(self, obj) # Call unbound method with explicit
self                                              
  File "/usr/lib/python2.3/pickle.py", line 576, in
save_tuple                                         
    save(element)                                     

  File "/usr/lib/python2.3/pickle.py", line 313, in
save                                               
    rv = reduce(self.proto)                           

  File "/usr/lib/python2.3/copy_reg.py", line 61, in
_reduce_ex                                        
    raise TypeError, "can't pickle %s objects" %
base.__name__                                         
TypeError: can't pickle Random objects                

>>>                  

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>Comment By: Raymond Hettinger (rhettinger)
Date: 2003-06-24 12:18

Message:
Logged In: YES 
user_id=80475

I cannot reproduce the error in Py2.3b1+:

Python 2.2.3 (#42, May 30 2003, 18:12:08) [MSC 32 bit 
(Intel)] on win32
Type "copyright", "credits" or "license" for more information.
IDLE 0.8 -- press F1 for help
>>> import random
>>> import pickle
>>> r = random.Random()
>>> pickle.dumps(r)
'(irandom\nRandom\np0\n(I1\n(I17199\nI25463\nI295
\ntp2\nNtp3\nb.'

The pickling tools had been updated recently and may have 
had a bug that was subsequently fixed.  Will add this to the 
test suite to make sure the bug stays dead.  If the new test 
doesn't provoke failure on some other platform, will mark 
this one as fixed and will close the bug report.

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