[yt-users] Pickle vs. _type_name

[Nathan Goldbaum]

I think it actually has to be

 _con_args = ("_base_region", "_field_cuts")


On Mon, Jun 17, 2013 at 11:35 AM, david collins <dcollins4096 at gmail.com>wrote:

> Thanks for the suggestion, Matt.
>
> I'm still getting an error-- I added the following to data_containers.py:
>
> <code>
> class InLineExtractedRegionBase(AMR3DData):
>     """    In-line extracted regions accept a base region and a set of
> field_cuts to
>     determine which points in a grid should be included.
>     """
>     _con_args = ("base_region", "field_cuts")
>     _type_name = "cut_region"
> </code>
>
> and now I get the error
>
> AttributeError: 'InLineExtractedRegionBase' object has no attribute
> 'base_region'
>
>   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-hg-hangnail/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
> 'base_region'
>
> Thanks a ton,
> d.
>
>
>
> On Mon, Jun 17, 2013 at 11:34 AM, Matthew Turk <matthewturk at gmail.com>wrote:
>
>> 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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