[Python-bugs-list] [ python-Bugs-452747 ] New-style class instances can't be pickled

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Bugs item #452747, was opened at 2001-08-18 17:45
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Category: Type/class unification
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Allan Crooks (amc1)
Assigned to: Guido van Rossum (gvanrossum)
>Summary: New-style class instances can't be pickled

Initial Comment:
Any class which extends either the dictionary or list 
types in Python 2.2a1 is both unpickable by both the 
pickle module and cPickle, and is uncopyable by the 
copy module.

Oh, and I'll use this opportunity to thank Guido and 
everyone who's ever worked on Python for making a 
programming language which is absolutely wonderful to 
program in. :)

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Comment By: Guido van Rossum (gvanrossum)
Date: 2001-08-18 23:35

Message:
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Thanks <blush> :-)

Regarding your bug, it's more general than what you describe
even: any class derived from object except certain built-in
classes are unpicklable.

I have to think about this --  part of my brain says that
this is how it should be, and that you can register your
constructor with copy_reg to make your type picklable, and
another part of my brain says that it should be supported
one way or another.

Changed the subject to reflect the problem better.

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