[issue5509] cPickle - module object has no attribute

2009-03-18 Thread Nathaniel Troutman 

New submission from Nathaniel Troutman :

If I define a class Foo in module A and in module A pickle out a list of
Foo objects to 'foo.pkl', then in module B attempt to unpickle 'foo.pkl'
I recieve the error "AttributeError: 'module' object has no attribute 'Foo'"

Attached are:
Foo.py which defines the class Foo and pickles out a list of objects

LoadFoo.py attempts to load the list of objects pickled by Foo

I'm running Vista with "Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08)
[MSC v.1310 32 bit (Intel)] on win32"

--
components: None
files: Foo.py
messages: 83759
nosy: ntroutman
severity: normal
status: open
title: cPickle - module object has no attribute
versions: Python 2.5
Added file: http://bugs.python.org/file13364/Foo.py

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[issue5509] cPickle - module object has no attribute

2009-03-18 Thread Nathaniel Troutman 

Nathaniel Troutman  added the comment:

Why can I only attach one file at a time?

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Added file: http://bugs.python.org/file13365/LoadFoo.py

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[issue5509] cPickle - module object has no attribute

2009-03-18 Thread Nathaniel Troutman 

Nathaniel Troutman  added the comment:

I believe I've tracked down the problem. When you run a python module
directly (ie "python Foo.py") any classes defined in the module have
their '__module__' attribute set to '__main__'. Which means the pickle
says the class is in '__main__' of whatever module is trying to load the
file.

I think it would make more sense to actually include the module name,
this means that an external module need simply ensure that the pickled
class's module be imported with the correct name.

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