[Python-bugs-list] [ python-Bugs-520645 ] unpickable basic types => confusing err

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Bugs item #520645, was opened at 2002-02-20 16:00
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Category: Type/class unification
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Samuele Pedroni (pedronis)
>Assigned to: Guido van Rossum (gvanrossum)
Summary: unpickable basic types => confusing err

Initial Comment:
E.g.

Python 2.2
>>> f=open('c:/autoexec.bat','r')
>>> w=open('c:/transit/p','w')
>>> import pickle as pic
>>> pic.dump(f,w)
Traceback (most recent call last):
<<snip>>
TypeError: coercing to Unicode: need string or buffer, 
file found
>>> import cPickle as cpic
>>> cpic.dump(f,w)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\USR\PYTHON22\lib\copy_reg.py", line 56, in 
_reduce
    state = base(self)
TypeError: coercing to Unicode: need string or buffer, 
file found

VS.

Python 2.1 
>>> f=open('c:/autoexec.bat','r')
>>> w=open('c:/transit/p','w')
>>> import pickle as pic
>>> pic.dump(f,w)
Traceback (most recent call last):
<<snip>>
pickle.PicklingError: can't pickle 'file' object: 
<open file 'c:/autoexec.bat',
mode 'r' at 00795290>
>>> import cPickle as cpic
>>> cpic.dump(f,w)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
cPickle.UnpickleableError: Cannot pickle <type 'file'> 
objects
>>>



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>Comment By: Guido van Rossum (gvanrossum)
Date: 2002-03-14 14:23

Message:
Logged In: YES 
user_id=6380

I cannot reproduce this on the 2.2.1 branch or on the CVS 
trunk.  I believe it was fixed by rev. 2.10 of copy_reg.py 
(without this even being the intention :-).

Closing.

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