[Tutor] cannot pickle instancemethod objects

[Kent Johnson]

hok kakada wrote:

>> What kind of object is matcher? Does it have any attributes that are
>> functions? (Not methods you defined for the class, but functions or
>> methods that you assign to attributes of self.)

> Actually, I use the translate-toolkit from 
> http://translate.sourceforge.net/snapshots/translate-toolkit-1.0.1rc1/
> in translate/search/match.py:
>         if comparer is None:
>             comparer = lshtein.LevenshteinComparer(max_length)
 >         self.comparer = comparer

> I just found the problem that it is because of the LevenshteinComparer. Once I 
> assign self.comparer = None, the I can dump the matcher successfully.
> However, I still don't understand what could be wrong with 
> LevenshteinComparer. 

I think the problem is this code in LevenshteinComparer.__init__():

         if Levenshtein:
             self.distance = self.native_distance
         else:
             self.distance = self.python_distance

which assigns an instance method to an instance attribute; this is the 
instancemethod that can't be pickled.

Kent

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