It occurred to me that pickle may have looked *everywhere* else, and
__builtin__ is just the last place it looked, which explains the
error. So perhaps I just need to install my class definition
*anywhere* that pickle can find it. Still the question stands though -
what's the best approach to achieve what I am trying to do? Thanks.
On Dec 1, 5:26 pm, hawkett <[EMAIL PROTECTED]> wrote:
> Hi,
>
> This might be a generic pythin question, but since I'm running into
> an issue on GAE with memcache, this is probably a good place to ask.
>
> I've got the following code
>
> opGlobals = {}
> exec(requestHandlerCode, opGlobals)
> requestHandler = opGlobals["RequestHandler"]()
> memcache.add(key="requestHandler", value=requestHandler)
>
> where 'requestHandlerCode' from the second line is just a python class
> definition retrieved from a TextProperty in the datastore. Lines 1-3
> execute fine, and I can call methods on the class instantiated in line
> 3. However, trying to put the instance into memcache as in line 4
> generates the following error -
>
> PicklingError: Can't pickle <class __builtin__.RequestHandler at
> 0x17ef0c0>: it's not found as __builtin__.RequestHandler
>
> Which is fine - I understand that it needs to be able to find the
> class definition in order to pickle/unpickle the object - what I'm not
> sure of is the best approach to resolving the problem. I could put
> the code in memcache, but then I'd be compiling and instantiating it
> every request, which is no good.
>
> The obvious options seem to be -
>
> 1. Install the class definition in __builtin__ so pickle does know
> what to do with it (feels like a hack?)
> 2. Tell pickle to also look elsewhere for the information it needs
>
> If someone who knows python better than I do could point me in the
> right direction, that would be great. Cheers,
>
> Colin
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