unhashable type when using pickle.load()

[Martin Franklin]

On Monday 17 Jun 2002 10:03 am, you wrote:
> I wonder if anyone can shed some light on a troublesome intermittent
> problem I am having.
>
> Firstly the necessary:
> I am running on windows XP, using jython 2.1 and java 1.3.1_03.
>
> A pickled file is created as follows:
>     pickle.dump((self.seq.getMotifs(), self.s[self.seqIdx]),
>                     newFile)
>
> self.seq.getMotifs() simply returns a dictionary containing various complex
> python objects (which will have been created and used sucessfully)
>
> self.s[self.seqIdx] is a python sequence object.
>
>
> Intermittently, when I try and reload from this pickle file I get the
> following exception:
>
>
> Exception occurred during event dispatching:
> Traceback (innermost last):
>   File "pars.py", line 129, in OpenFile
>   File "D:\program files\jython-2.1\Lib\pickle.py", line 947, in load
>   File "D:\program files\jython-2.1\Lib\pickle.py", line 567, in load
>   File "D:\program files\jython-2.1\Lib\pickle.py", line 885, in
> load_setitem
> TypeError: unhashable type
>
> I have read that this error typically can occur when a pyDictionary or
> pyList is inserted into a hashtable. Is this a problem that anyone else is
> familiar with, is it a limitation of the jython implementation of pickle?
>
> Any help will be appreciated
>
> Blobby


Mark,

Could you be falling foul of a file close() problem IOW are you closing the 
file explicitly?  This could be a GC thing (discussed recently) where java 
rather than python's GC is not closing the file when it goes out of scope....

Could be way off but worth saying.
Cheers,
Martin