[ python-Bugs-1114776 ] copy.py bug

[SourceForge.net]

Bugs item #1114776, was opened at 2005-02-02 15:43
Message generated for change (Comment added) made by aleax
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1114776&group_id=5470

Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 9
Submitted By: Vincenzo Di Somma (disommav)
Assigned to: Anthony Baxter (anthonybaxter)
Summary: copy.py bug

Initial Comment:
upgrading from python 2.3.4 to 2.3.5rc1 I got this
error on a module that was working correctly


  File "../Field.py", line 203, in copy
    properties = deepcopy(cdict)
  File "/usr/lib/python2.3/copy.py", line 191, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python2.3/copy.py", line 285, in
_deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib/python2.3/copy.py", line 200, in deepcopy
    copier = _getspecial(cls, "__deepcopy__")
  File "/usr/lib/python2.3/copy.py", line 66, in
_getspecial
    for basecls in cls.__mro__:
AttributeError: __mro__


----------------------------------------------------------------------

>Comment By: Alex Martelli (aleax)
Date: 2005-02-06 08:57

Message:
Logged In: YES 
user_id=60314

Fixed (using inspect.getmro instead of direct __mro__ access) -- added 
unittest for that thanks to John Lenton's suggestion on c.l.py

----------------------------------------------------------------------

Comment By: Alex Martelli (aleax)
Date: 2005-02-05 10:07

Message:
Logged In: YES 
user_id=60314

The problem's easy to fix (using inspect.getmro instead of direct 
__mro__ access) but hard to reproduce -- what type not recorded in the 
dispatch table lacks an __mro__?  Can't find one easily, and I'd like to 
have a unit-test reproducing the bug before I commit the fix.

Vincenzo, can you explain what the type is happening to be in that value 
whose deepcopy gives problems?  or can anybody else suggest a type as 
above?

----------------------------------------------------------------------

Comment By: Anthony Baxter (anthonybaxter)
Date: 2005-02-03 04:26

Message:
Logged In: YES 
user_id=29957

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=293338
has a fuller stack trace.


----------------------------------------------------------------------

Comment By: Michael Hudson (mwh)
Date: 2005-02-02 20:35

Message:
Logged In: YES 
user_id=6656

Eek, that sounds pretty bad!  Can you attach the code/cook up a smaller 
test case?

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1114776&group_id=5470