[yt-users] Pickle vs. _type_name

[Matthew Turk]

Hi Dave,

I think it needs the following items:

_con_args = ("base_region", "field_cuts")
_type_name = "cut_region"

in the class definition and I think it should be good to go.

-Matt

On Mon, Jun 17, 2013 at 1:32 PM, David Collins <dcollins4096 at gmail.com> wrote:
> Hi, all--
>
> I'm trying to pickle a dataset I made with cut_region.  This fails on the
> call to __reduce__ since the cut_region doesn't have a _type_name attribute.
> Is there an easy way to give _type_names to cut regions in general, or
> should I clone the __reduce__ method for InLineExtractedRegionBase?
>
> I generate the object like this:
>
>>> region = pf.h.region(Center,Left,Right)
>>> cut_region = region.cut_region(['grid[some_field] == some_value'})
>>> file = open(args)
>>> cPickle.dump(cut_region,file)
>
>  which gives the following error:
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/nics/b/home/collins/yt2.0/fPickle.py", line 15, in dump
>     output = cPickle.dump(object,file,*args,**kwargs)
>   File
> "/nics/b/home/collins/local_2013_03_12/src/yt-dave/yt/data_objects/data_containers.py",
> line 407, in __reduce__
>     [getattr(self, n) for n in self._con_args] +
> AttributeError: 'InLineExtractedRegionBase' object has no attribute
> '_type_name'
>
>
> Thanks!
> d.
>
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