Pickling a dictionary

[Ian Kelly]

On Wed, Nov 7, 2012 at 9:16 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Wed, Nov 7, 2012 at 9:07 AM, Devashish Tyagi
> <devashishrocker at gmail.com> wrote:
>> So I want to store the current state of a InteractiveInterpreter Object in database. In order to achieve this I tried this
>>
>> obj = InteractiveInterpreter()
>> local = obj.locals()
>> pickle.dump(local, open('obj.dump','rw'))
>>
>> But I received an error say
>> TypeError: can't pickle ellipsis objects
>>
>> From what I understand this shouldn't occur as local is a dictionary. Any particular reason for this behaviour?
>
> The contents of the dictionary need to be pickleable as well.  You
> probably have an ellipsis object in the dict somewhere.

By the way, if you use Python 3 and pickle protocol 3, then Ellipsis
*is* pickleable:

Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pickle
>>> pickle.dumps(Ellipsis, protocol=pickle.HIGHEST_PROTOCOL)
b'\x80\x03cbuiltins\nEllipsis\nq\x00.'

Cheers,
Ian