On Feb 6, 2008 9:08 AM, Georg <[EMAIL PROTECTED]> wrote:
>
> Hi,
> using sage-2.10.1 on a Debian Etch system,
> look at the following short file called "example.sage":
>
> class BMV:
> def __init__(self):
> self.l = range(5)
> def write(self):
> save(self, 'foo')
> M = BMV()
>
> it works as expected:
> sage: load "example.sage"
> sage: M.write()
> sage: M = 0
> sage: M = load('foo')
> sage: M.l
> [0, 1, 2, 3, 4]
>
> but including the line
> M.write()
> into the script "example.sage":
>
> class BMV:
> def __init__(self):
> self.l = range(5)
> def write(self):
> save(self, 'foo')
> M = BMV()
> M.write()
>
> yields:
> sage: load "example.sage"
> ---------------------------------------------------------------------------
> <class 'cPickle.PicklingError'> Traceback (most recent call
> last)
>
> /home/georg/.sage/temp/HILBERT/7199/
> _home_georg_Daten_Sync_Software_Experimente_sage_save_example_sage_43.py
> in <module>()
> 10
> 11 M = BMV()
> ---> 12 M.write() 13
> 14
>
> /home/georg/.sage/temp/HILBERT/7199/
> _home_georg_Daten_Sync_Software_Experimente_sage_save_example_sage_43.py
> in write(self)
> 7
> 8 def write(self):
> ----> 9 save(self, 'foo')
> 10
> 11 M = BMV()
>
> /home/georg/Daten/Sync/Software/Experimente/sage/save/sage_object.pyx
> in sage.structure.sage_object.save()
> 482
> 483
> --> 484
> 485
> 486
>
> <class 'cPickle.PicklingError'>: Can't pickle __main__.BMV: attribute
> lookup __main__.BMV failed
> WARNING: Failure executing file: </home/georg/.sage/temp/HILBERT/7199/
> _home_georg_Daten_Sync_Software_Experimente_sage_save_example_sage_43.py>
>
>
> Is this a bug or why does it not work?
It's not a bug -- it is a feature of how Python works. You can't
pickle user defined objects
if the code that defines their class isn't in a place that Python can
easily find any time in the
future, e.g., in the Python site-packages directory.
Hopefully somebody can say more... I'm at a nice talk right now at Sage Days 7.
William
William
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